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IrC
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Quote: Originally posted by neptunium  | | thanks for this fascinating story Irc ! i will have to plan one of my trips there this summer! however because of new regulations and radiation
detectors at weigh stations there is a radiological limit to how much ore one can haul away... ha the good old days pre 9/11 |
Load the crap out of your truck. From Fredonia 89 back towards Flagstaff. Halfway between turn left on 160 straight the F up, so steep it's damn near
switchbacks, into Tuba City. Through the Navajo reservation on 160, bear left at Teec Nos Pos, don't go straight on the main drag that is 489 to
Farmington New Mexico. You want to stay on 160. In fact you might want to hang out in the area for a while. I stayed on the Res for a while in the
same year as the story above and the people were unbelievable. Anyway you will cross into NM for a very short stretch then into 160/491 into Colorado,
drifting back east at Cortez. 160 east all the way across Kansas. Not sure where you are going back to but assuming you have a CB on channel 19 you
can get info around every single weigh station there is. Besides I have never seen any laws relating to having mere rocks from the ground. Just don't
go 40 miles east past Pagosa Springs if there is bad weather with ice anywhere, Wolf Creek Pass is one scary SOB if the road is bad.
Myself I would go the easy way and if they gave me crap at a weigh station (which you don't pull into anyway unless your GVW is over 26,000 pounds) if
they gave me flak they would soon hear the many ways they could bite my shiny metal ass. Actually you could after Teec Nos Pos stay on 489, turn right
at Farmington heading back down to I-40. At least this avoids the only thing cars and pickups do stop at, the agricultural inspection station on I-40
in Arizona before you get into New Mexico.
This is still America and we are still a free people no matter how anal retentive the DHS wishes to be and hauling your load of minerals you dig out
of the ground is not illegal. Screw Em. If your really worried wrap lead sheet around your boxes of rocks.
I forgot to ask, what new regulations and how does this relate to minerals from a prospecting trip? Tell them you run a rock shop.
Also, I got the letter wrong. All this talk prompted me to go dig out my chrome beast and it's not a Precision 111B, change the B to a C. I also
learned 2 things I had not considered in the talk in this thread. Found a link describing how much better the crystal is in my C than the B model.
Honestly never read that before but back in those days we had no internet and finding things at a local library could be near impossible. Second,
bfessers link. I never knew about looking at plant life actually being a tool for surveying deposits. I just found it out through experience by
happening to camp on top of three mile Island's desert vacation spot. Looking at a cactus growing back out of a cactus. No pre knowledge of the
subject (other than all the 'B' scifi in the 60's) yet it clicked in my mind after seeing the glow later that night that high radiation had to be the
cause. That second day I started noticing the deformed patches of prickly pear and even though my scintillator had dead batteries I knew the area was
hot. So much so I moved my campsite out of paranoia which is why I had to load a backpack with samples from the creek bed. I just was not comfortable
sleeping on a perfect set for yet another stupid radioactive giant ants movie.
On another note neptunium if you do make a trip do us all a favor. I had no camera that trip. See if you can locate and photograph some of those scary
looking deformed cacti. I suppose it's possible Exide found and dug up all the really hot spots but the area was so big. Surely if you do some hiking
around there must be untouched places. This site was the largest I ever found in all the years out prospecting. Another question I have is can anyone
explain the conditions where the Radium concentration is so much higher than typical pitchblende finds. I have Uraninite from various places in the
southwest and I still have some of the rocks from this 1975 trip. 34 years later these rocks are still a hell of a lot hotter than various Uraninite
rocks I have, much hotter than even my choice Coffinite specimens.
The area is very ancient volcanic, if you go straight south from this location to the north rim you will find a half mile wide stretch of nearly 100
percent Obsidian from the cliff top all the way down to the Colorado river. Standing there looking down at the river I kept having visions of being
sliced into hamburger if I slipped and slid down that thing. Nothing but sharp shards of black glass, very frightening looking cheese grater. So is it
possible deposits brought up in lava flows from deep in the earth concentrate Radium? Or was it merely the decay over eons of an unusually high
percent per ton Uranium content?
On another note I just got a dozen BPW34's, bfesser do you have a schematic for your APOC kit? If you cannot post it does U2U allow files? I was going
to build one using LMP7721's but looking at the part list yours looks simpler to build. Plus I have those parts in standard sizes meaning I could
avoid dealing with surface mount components.
[Edited on 1-10-2014 by IrC]
"Science is the belief in the ignorance of the experts" Richard Feynman
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neptunium
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you were increadibly lucky Irc to find this spot its an amazing story ! the regulations i was mentioning are unworthy of this forum and concern
commercial drivers (80 000lbs and up)
but i have found maps that indicates a hot area in Ohio (?) wich would be a lot closer to me (Michigan) and easier to haul away ... however i cannot
pinpoint the exact location and the geology of this area doesnt look uranium ore prone.
having said that Uranium pops out of the ground like gold , a little bit everywhere..
i do agree with you on the freedom to pick rock out of the ground i just hate to see it confiscated because it triggered the detector i am not a
confrontational dude especialy with the cops..
[Edited on 10-1-2014 by neptunium]
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IrC
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I don't think discussing the laws today are really off topic. The title is 'interest in radioactivity', and information about what we need to be
concerned with actually going out and finding specimens seems pertinent. Pretty much this was how I looked at telling the story of my Hacks Canyon
find, providing another great location for members serious about doing some digging for rocks. Myself I always try to avoid confrontations also but
having done something like prospecting all my life I just do not think I would allow their unreasonable paranoia to stop me from going out and finding
rocks to bring home. But that's just me.
I should add as with bfessers location, sedimentary deposits are fairly common so at least one could look for sandstone bearing Carnotite. Believe it
or not there is a very hot location in black shale not too far from me and Arkansas is probably the last place I would go if looking for Uranium. Even
though there is volcanic rocks down south this state is not known for much along these lines. I mention this anomaly since no doubt shale exists in
your part of the country.
http://www.dangerouslaboratories.org/rak.html
The specimens there are very hot and it is more or less something one would not expect to be possible around here.
A good place to get ideas when planning your outings:
http://www.dangerouslaboratories.org/radrocks.html
I suppose it is up to bfesser if the last few posts are off topic, but to me it seems pertinent information to aid members who wish to go find some
specimens to experiment with or test out their detector projects. Especially considering how much more expensive good specimens on ebay are getting. I
also noticed United Nuclear which once was a decent source seems to eternally be sold out of everything, on top of being too pricey as well. At this
point a nice 'working' summer vacation to go out and do some digging may well be worthwhile.
[Edited on 1-10-2014 by IrC]
"Science is the belief in the ignorance of the experts" Richard Feynman
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bfesser
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| Quote: Originally posted by IrC | | On another note I just got a dozen BPW34's, bfesser do you have a schematic for your APOC kit? If you cannot post it does U2U allow files?
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I do not. I'm not sure if it was clear in my post, but I haven't (yet) purchased the kit. I
<em>have</em> already started work on reverse-engineering the PCB to a schematic, based on the photos the <a
href="http://excelphysics.com/" target="_blank">ExcelPhysics</a> <img src="../scipics/_ext.png" /> website. If I do purchase the kit,
I'll scan and upload both sides of the unpopulated PCB—I don't see a screen printed copyright on the PCB, so screw 'em. <em>And screw
'em again for not making it <a href="http://en.wikipedia.org/wiki/Open-source_hardware" target="_blank">OSHW</a> <img
src="../scipics/_wiki.png" />!</em> | Quote: Originally posted by IrC | I don't think discussing the laws today are really off topic. The title is 'interest in radioactivity', and information about what we need to be
concerned with actually going out and finding specimens seems pertinent.
. . .
I suppose it is up to bfesser if the last few posts are off topic, but to me it seems pertinent information to aid members who wish to go find some
specimens to experiment with or test out their detector projects. |
I concur. This is exactly what I hoped to
see in this topic, and why I tried to give it a rather generic subject line. Of course, the presence of this topic shouldn't be seen as a barrier to
opening additional threads with specific foci.
As for sedimentary concentrations of radioactive minerals, I haven't found any in my locality—and I think they're highly unlikely in the
particular sedimentary strata of my area. <del>I've found some dendritic manganite in the Decorah shale, but not much else.</del> [edit]
(After looking through the specimens in my drawers, I found that I had been thinking of a specimen of manganese dendrites on dolostone from the
Madison formation in Wyoming.) I've found nothing here but calcite and Ordovician marine fossils, but as soon as the mercury rises, I'll be out
searching again.
[Edited on 10.1.14 by bfesser]
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IrC
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OK, done for a while anyway. Someone recently talked me into looking for my copy of THEM! and watching it. Been years since I saw that one.
"Science is the belief in the ignorance of the experts" Richard Feynman
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Metacelsus
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How much radiation does it take to actually cause a noticeable concentration of deformities in plants? It seems like said areas would be a severe
health risk.
Side note:
I always am peeved by blatant violations of the square-cube relation (6 foot tall ants ).
Yes, I have seen THEM!
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bfesser
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Cheddite Cheese, I would <em>guess</em> that the effects are caused by the plants having actually incorporated
significant quantities of radioisotopes through uptake of ground water—but I have yet to read more on the subject than the Wikipedia
article.
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Metacelsus
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Yes, but anyone drinking water or eating food grown there would be at the same risk.
https://www.sciencedirect.com/science/journal/05315131/1276
(I was thinking more long-term health risks than short-term ones.)
[Edited on 10-1-2014 by Cheddite Cheese]
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neptunium
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Irc when i mentioned picking up a few rock i had a complete differente idea in mind. i collect element and also mess with nuclear physics a little...
my idea is to chemicaly separate massive amount of ore to obtain significant amount of Radium, Thorium, and other uranium daughters.
so a dozen 5 gallons buckets fill with hot ore would hardly pass as a rock collection trip and would positively register on even the less sentitive
detector . adding shielding would considerably increase the weigh of such load...
several trips would be required...
i find it so damn interesting i just cant help myself! the satifaction of accomplishing what Marie Curie did over 100 years ago is such an intelectual
reward it over rides all risk and posible penalty! .... but thats just my dumbassand ...
also nature provide so much more than united nuclear!
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neptunium
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radiation is an everyday part of life at what point does it become dangerous is hard to say when it comes to natural radioactivity, not too many
people live in the area mentioned above a few trips of 2 or 3 days per year would certainly not harm anyone (unless you eat the stuff and sleep with
it )
as for the water supply contamination i would love to get my hands on a sample of water from the area and run it through my spectrometer..
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IrC
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| Quote: Originally posted by neptunium | Irc when i mentioned picking up a few rock i had a complete differente idea in mind. i collect element and also mess with nuclear physics a little...
my idea is to chemicaly separate massive amount of ore to obtain significant amount of Radium, Thorium, and other uranium daughters.
so a dozen 5 gallons buckets fill with hot ore would hardly pass as a rock collection trip and would positively register on even the less sentitive
detector . adding shielding would considerably increase the weigh of such load...
several trips would be required...
i find it so damn interesting i just cant help myself! the satifaction of accomplishing what Marie Curie did over 100 years ago is such an intelectual
reward it over rides all risk and posible penalty! .... but thats just my dumbassand ...
also nature provide so much more than united nuclear!
|
Having natural rocks for specimens is one thing, but trying to concentrate radioactive elements opens up a whole new realm of needing to be licensed
since there are serious regulations involving this area. I could be incorrect I really never studied the subject of law on this (I study what I am
interested in doing at the time and building a lab full of centrifuges has never been on the agenda), however I think this would not be a good idea
for the amateur for many reasons. Never forget the price the Curie's paid for their curiosity, and you would have to deal with the NRC and DHS.
Something which never existed in their day.
"Science is the belief in the ignorance of the experts" Richard Feynman
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neptunium
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very true Irc...this is probably going to remain a fantasy ...
bfesser check out this meter
http://www.ebay.com/itm/RPI-Rad-Monitor-Survey-Meter-DX-6000...
if i am not mistaken it is a scintillation probe ... often better and more sensitive than geiger tube
[Edited on 10-1-2014 by neptunium]
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bfesser
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Thanks for the link, <strong>neptunium</strong>, I've been wanting to build a <a href="http://en.wikipedia.org/wiki/Scintillator"
target="_blank">scintillation detector</a> <img src="../scipics/_wiki.png" />, but they're invariably more expensive than the PIN
photodiode-based designs—much more than I can afford at the moment.
<hr width="80%" />
I'll try to compile a list of radiation detector kits (online):
<a href="https://sites.google.com/site/diygeigercounter/" target="_blank">DIYGeigerCounter</a> <img src="../scipics/_ext.png" />
<a href="http://www.goldmine-elec-products.com/products.asp?dept=1468" target="_blank">Electronic Goldmine</a> <img
src="../scipics/_ext.png" />
<a href="http://excelphysics.com/collections/apoc-detector" target="_blank">ExcelPhysics APOC Detector</a> <img
src="../scipics/_ext.png" />
<a href="http://www.imagesco.com/geiger/geiger-counter-kits.html" target="_blank">Images Scientific Instruments</a> <img
src="../scipics/_ext.png" />
<a
href="http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&categoryName=cat_7
0&subCategoryName=Education%20%26%20Hobby%20Kits%20%2F%20Educational%20Kits&category=7030&refine=1&position=1&history=c243uwxf%7Cf
reeText~geiger%5Esearch_type~jamecoall%5EprodPage~15%5Epage~SEARCH%252BNAV" target="_blank">Jameco Electronics</a> <img
src="../scipics/_ext.png" />
<a href="http://www.madscientisthut.com/Shopping/agora.cgi?product=Radiation%20Detection" target="_blank">Mad Scientist Hut</a> <img
src="../scipics/_ext.png" />
<a href="http://mightyohm.com/blog/products/geiger-counter/" target="_blank">MightyOhm.com Geiger Counter</a> <img
src="../scipics/_ext.png" />
<a href="http://radiohobbystore.com/diy-kits.html" target="_blank">RH Electronics</a> <img src="../scipics/_ext.png" />
<a href="https://www.sparkfun.com/products/11345" target="_blank">SparkFun Electronics</a> <img src="../scipics/_ext.png" />
[Edited on 20.1.14 by bfesser]
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neptunium
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you know you can build your own scintillation detector ...
thats what i did with a cheap photomultiplier, a 14 pin base from an old oscilloscope a few resistor, there is some plastic scintillator for 30
dollars availlable too. and a high voltage DC power... of course i understand the DC power arent cheap but sometimes with a little luck you can find
one less than a hundred bucks on ebay.
i have noticed an increadible increase in the price of radiation detector scintillation crystals and such since the Fukushima disaster...
supply and demand..
[Edited on 10-1-2014 by neptunium]
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Varmint
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For anyone interested in copying the (7) BPW-34 design, if it were me I'd run one op-amp per diode, then sum them all together for the final output.
Reasoning: Being "large area" devices, they have a significant amount of capacitance which hinders their response in both time and amplitude. When
you parallel 7 of them, each "strike" which of course only happens on one device, has the combined capacitance of 7 devices to attenuate and stretch
the pulse.
DAS
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neptunium
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its a good idea but the thickness is lacking to absorb (and create a signal ) so your spectrum (the photo peak) would suffer greatly making it a wide
one smudge...
it doesnt matter for a simple detection but if you want to do spectroscopy its a bust
[Edited on 10-1-2014 by neptunium]
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bfesser
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Thread Pruned
10-1-2014 at 13:12 |
IrC
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| Quote: Originally posted by Varmint | For anyone interested in copying the (7) BPW-34 design, if it were me I'd run one op-amp per diode, then sum them all together for the final output.
Reasoning: Being "large area" devices, they have a significant amount of capacitance which hinders their response in both time and amplitude. When
you parallel 7 of them, each "strike" which of course only happens on one device, has the combined capacitance of 7 devices to attenuate and stretch
the pulse.
DAS |
http://circuitsalad.com/2012/11/19/a-solid-state-photodiode-...
I posted this on page 2 but not a bad idea to look at it again since it discusses this capacitance problem and gives useful math for design
consideration. While expensive I think the single large area detector (PS100-7-CER-PIN) is a better route.
http://einstlab.web.fc2.com/Gamma/spectroscopy.html
This link on Gamma spectroscopy is also interesting reading.
The sites main page is Japanese but several English pages are on it which are also interesting such as:
http://einstlab.web.fc2.com/geigerE/geiger.html
He does not provide the code for the Pic, I assume because he sold it to a company to manufacture and sell as a kit. In any case a great project with
a wealth of circuit ideas and plans to easily build the 'air Geiger tube'. I especially liked the butane lighter supply of quenching gas since dealing
with pump systems and halogens to refill Geiger tubes is not my first choice in a home setting. You really should study this one.
http://j-kosaku.jp/ if anyone is interested in the kit itself.
http://einstlab.web.fc2.com/Xdetector/detector.html
Back to the photodiode subject, this page has a few broken image links but still good reading, image below is from the page. I like this circuit
because the LMC662 is not a bad opamp for this circuit but mainly because I have the IC already. Always helps to have everything in stock when
tinkering.
[Edited on 1-11-2014 by IrC]
"Science is the belief in the ignorance of the experts" Richard Feynman
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bfesser
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The follow-up blog post <a href="http://circuitsalad.com/2013/01/08/solid-state-radiation-detector-with-lcd-complete/" target="_blank">Solid
State Radiation Detector with LCD Complete!</a> <img src="../scipics/_ext.png" /> (Circuit Salad)
Attachment: dsp_geiger.gif.tar.gz (33kB)
This file has been downloaded 830 times
<hr width="80%" />
Last night, I added a few new <a href="http://en.wikipedia.org/wiki/Rare_earth_mineral" target="_blank">rare earth mineral</a> <img
src="../scipics/_wiki.png" /> specimens to my collection. Nothing too fancy, but they exhibit the expected radioactivity. I recieved a small
specimen of <a href="http://en.wikipedia.org/wiki/Gadolinite-(Y)" target="_blank">gadolinite-(Y)</a> <img src="../scipics/_wiki.png"
/> (also known as ytterbite), a specimen of <a href="http://en.wikipedia.org/wiki/Xenotime" target="_blank">xenotime</a> <img
src="../scipics/_wiki.png" /> in fluorite, a specimen of xenotime in quartz, and a specimen of <a
href="http://en.wikipedia.org/wiki/Samarskite-(Y)" target="_blank">samarskite-(Yb)</a> <img src="../scipics/_wiki.png" />; all from the
<a href="http://www.mindat.org/loc-66693.html" target="_blank">South Platte Pegmatite District, Jefferson Co., Colorado</a> <img
src="../scipics/_ext.png" />. A rough measure of the samarskite showed ~3.5×10<sup>3</sup> CPM, so I put it in a lead pig to
keep the cat from sleeping on it. I'm very pleased with these new additions to my collection, but I'm still hoping to get a specimen of gadolinite
from <a href="http://www.mindat.org/loc-3191.html" target="_blank">its type locality</a> <img src="../scipics/_ext.png" /> sometime
in the future—which may prove difficult, as collecting from the quarry site has been prohibited since the 1970's.
[edit] I've taken and uploaded <a href="http://www.flickr.com/photos/35937732@N02/sets/72157639665100206/" target="_blank">some
photos</a> <img src="../scipics/_ext.png" /> of my collection radioactivity related items, including my new mineral specimens. I've also
uploaded two short videos to YouTube; one <a href="http://youtu.be/7QmuvC0-F2M" target="_blank">demonstrating the modified firmware</a>
<img src="../scipics/_yt.png" /> on my MightyOhm.com kit along with the activity of my samarskite-(Yb), and the other showing the activity of my
previously-mentioned <a href="http://youtu.be/HGQlYvI5oWY" target="_blank">'hot plate'</a> <img src="../scipics/_yt.png" />
(~9.5×10<sup>3</sup> CPM).
I apologize for the quality of the photos, in particular—these are the best I could coax out of my Nikon S9300 point-and-shoot. To
exacerbate things, I hadn't noticed that I had left the exposure set low from previous use, which I've tried to correct in GIMP.
[Edited on 20.1.14 by bfesser]
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bfesser
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Thread Bumped
12-1-2014 at 19:26 |
Varmint
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IRC, why worry about the slight supply mismatch? The CMRR of any op-amps you use will render minimal differences like yours irrelevant.
Believe me, I understand perfection is always a worthy goal, I'm a bit retentive in that way as well. But at some point you have to consider the
devices we use (and even discrete circuits we design) can handle these differences without worry.
If low noise is what you desire, a good battery supply with adequate local bypassing can run rings around almost anything mains-connected.
Add a couple of regulators to keep the rails "perfect", and now you've added noise you didn't have before. Let the CMRR do the work for you.
DAS
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bfesser
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I think it was definitely worth the work. Half the fun is the process, isn't it—or is that half the torture? Anyway, this is a bit over my
head; I had to look up <a href="http://en.wikipedia.org/wiki/Common-mode_rejection_ratio" target="_blank">common-mode rejection ratio</a>
<img src="../scipics/_wiki.png" /> (CMRR). Looking at the specs listed, both op-amps are given CMRR - min: 70 dB. You could try using a <a
href="http://www.mouser.com/ProductDetail/Texas-Instruments/TLC2272CP/?qs=sGAEpiMZZMtCHixnSjNA6NDQA1eMYwPy1dlIO6ln6a4%3d"
target="_blank">TLC2272</a> <img src="../scipics/_ext.png" /> instead, but from my (limited) understanding, it would restrict your
output voltages to a narrower range than the <a
href="http://www.mouser.com/ProductDetail/Texas-Instruments/LM1458N-NOPB/?qs=sGAEpiMZZMtOXy69nW9rM4ua1u5LNaSPM2gVRMNTLCs%3d"
target="_blank">LM1458</a> <img src="../scipics/_ext.png" />. If you still have the address, could you post a link to the circuit you
based yours on?
I finally ordered some BPW34s last night, and am eager for them to arrive so I can start experimenting! In the mean time, I've been brushing up on
Civil Defense gear at the <a href="http://www.orau.org/ptp/museumdirectory.htm" target="_blank">ORAU museum site</a> <img
src="../scipics/_ext.png" />, and kicking myself for not buying a <a href="http://www.orau.org/ptp/collection/civildefense/cdv750mod6new.htm"
target="_blank">CD V-750 Model 6</a> <img src="../scipics/_ext.png" /> when I had the chance.
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bfesser
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Thread Split
14-1-2014 at 20:14 |
IrC
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Spent hours searching neutron production in an effort to find a simple low cost way to produce neutrons to test out my neutron detector. If anyone is
working along these lines the partial list of patents below contains much useful information.
Neutron search:
http://www.freepatentsonline.com/result.html?sort=relevance&...
United States Patents for producing neutrons:
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2240914 Device for converting atoms
2489436 Method and apparatus for producing neutrons
2211668 Electronic device
2983834 Neutron discharge tube
2251190 Method of producing neutrons
2161985 Process of producing radio-active elements
2500223 Artificial atomic disintegration
0917191 No Title
2206634 Process for the production of radioactive substances
3766389 TARGET FOR PRODUCING NEUTRONS
3167655 Target for a neutron generator consisting of a coating of one of the lanthanon elements on a base metal
2967245 Neutron source for well logging apparatus
3183356 Neutron source
3084256 Neutron generator
2986441 Neutron generator targets
2975113 Method of fabrication of an irradiation transmutation capsule
2859095 Process of producing cm244 and cm245
2816242 Neutron sources
2712081 N/A
2592115 Neutron source
2440999 Compressed neutron source
2253035 Apparatus for the production of a ray of slow neutrons
1620081 Alloy of lithium and aluminum
1333965 Alloy
3320422 Solid tritium and deuterium targets for neutron generator
3124711 No Title
2951945 Renewable target
2576600 Device for generating neutrons
2943239 Method and apparatus for renewing targets
[Edited on 1-18-2014 by IrC]
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"Science is the belief in the ignorance of the experts" Richard Feynman
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bfesser
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Thread Split
18-1-2014 at 09:44 |
IrC
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Too many patents for one post. Thought I would save people the time looking for the files.
Attachment: US2951945A.pdf (318kB)
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I should add the search in the post above includes patents for detection while I tried to focus mainly on production in the ones listed here and in
the post above.
[Edited on 1-19-2014 by IrC]
"Science is the belief in the ignorance of the experts" Richard Feynman
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bfesser
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Some links:
<a href="http://dmytry.com/electronics/microgeiger.html" target="_blank">MicroGeiger</a> <img src="../scipics/_ext.png" />
(dmytry.com)
<a href="http://boginjr.com/electronics/lv/no-semiconductor-geiger/" target="_blank">Semiconductor free Geiger Counter</a> <img
src="../scipics/_ext.png" /> (Bogin, Jr.)
<a href="http://makezine.com/projects/make-34/hand-crank-geiger-counter/" target="_blank">Hand-Crank Geiger Counter</a> <img
src="../scipics/_ext.png" /> (makezine.com)
<a href="http://danyk.cz/gm.html" target="_blank">GM Počítadlo - měřič radioaktivity</a> <img
src="../scipics/_ext.png" /> (danyk.cz)
<a href="http://www.mikrocontroller.net/topic/anschluss-und-verwendung-von-geiger-mueller-sbm-20" target="_blank">Anschluss und Verwendung von
Geiger Müller SBM-20</a> <img src="../scipics/_ext.png" /> (mikrocontroller.net)
<a href="http://www.atomicrocks.com/html/redbluff.html" target="_blank">Red Bluff Mine</a> <img src="../scipics/_ext.png" /> (Atomic
Rocks)
<a href="http://intercontinentalcry.org/a-birds-eye-view-of-uranium-mining-near-the-grand-canyon/" target="_blank">A Bird's Eye View of Uranium
Mining Near the Grand Canyon</a> <img src="../scipics/_ext.png" /> (IC Magazine)
<a href="http://rockhounders1.com/Hack%20Mine.htm" target="_blank">Uranium mines</a> <img src="../scipics/_ext.png" /> (John &
Shirley Bloomfield )
<a href="http://www.mindat.org/loc-37364.html" target="_blank">Hack Canyon Mine …, Hack Canyon, Hack Canyon District, Mohave Co.,
Arizona, USA</a> <img src="../scipics/_ext.png" /> (MinDat.org)
[Edited on 7.2.14 by bfesser]
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IrC
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Something about that Hacks Canyon link is confusing. The copper mine was about 11 miles southwest of the location I described, but in 1975 it looked
abandoned to me. Did they open it again, as one pic I saw made it sound as if in 1989 they were running the mine again. Am I reading that right? Makes
sense I imagine by 1989 copper was starting to rise in price making old mines worth operating again. Hacks Canyon is a cool place, think Martian
canals. Miles long with branching tributaries, cut into the earth. Standing on the desert floor you wouldn't think it existed until you walk close
enough to see the cut in the earth. What I wouldn't give to go back and explore all that again now that I know so much more about how to look and what
to look for. After looking at prices on ebay lately for radioactive rock specimens one could make a decent living collecting rocks in the area. The
canyon is miles long with forks and branches all over.
"Science is the belief in the ignorance of the experts" Richard Feynman
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bfesser
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Yes, I think you are reading that right—I noted the date on the picture, as well. I've never been out in a desert before, only driven
through one when I was very little, but from what I saw in photos, the views must be absolutely breathtaking. It looks like paradise to me, with
plentiful rocks and geologic formations to study. I would love to explore the entire region; and I bet I'll have dreams tonight of purchasing a claim
and prospecting mineral specimens for a living. [sigh]
A quick survey of Google search results hints that uranium mining in the Grand Canyon area has fallen under public scrutiny and has become a political
struggle between ecological organizations allied with the indigenous Native American tribes and those who wish to mine the rich deposits.
Unfortunately, it also looks like the mineral rights in much of the area of interest have been claimed.
  <a href="http://intercontinentalcry.org/wp-content/uploads/grand-canyon-mining-claims1.jpg" target="_blank"><img
src="http://intercontinentalcry.org/wp-content/uploads/grand-canyon-mining-claims1.jpg" width="250" /></a>
<a href="http://www.nytimes.com/2011/03/08/opinion/08tue4.html" target="_blank">The Grand Canyon Uranium Rush</a> <img
src="../scipics/_ext.png" /> (New York Times)
<a href="http://www.bbc.co.uk/news/world-us-canada-11350744" target="_blank">'Uranium rush' prompts Grand Canyon fears</a> <img
src="../scipics/_ext.png" /> (BBC)
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[Edited on 7.2.14 by bfesser]
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