Quick! Cover that crystal with something opaque. It's not as sensitive as photo film, but if you leave it exposed to light for a while, it will yellow and...
6442
jameskpolka
Jul 2, 2006 5:25 pm
whoa ... i seem to have stumbled into The Right Group! My PRI 107C was the first thing I ever bought from an ad -- probably Popular Mechanics or Science...
6443
Craig
siliconhillb...
Jul 2, 2006 7:17 pm
Hi James, The usual solution these days is to build a small switching power supply that runs off of 4.5 to 6V to supply the 45 and 67 volts required by the...
6444
Craig
siliconhillb...
Jul 2, 2006 7:36 pm
Here is the web address I was thinking of. I didn't get a response to the battery substitution site. Might not be in business any more. ...
6445
GEOelectronics
K0FF
Jul 2, 2006 8:41 pm
It's good you found the link to Al's webpage. He makes the power supply modules that eliminate the need for the special batteries. Getting a proven circuit...
6446
GEOelectronics
K0FF
Jul 2, 2006 9:04 pm
Now that the hot weather is here, it's time to change the probes in your vehicular radiation detector setups. Remove any thin window ( pancake, end-window)...
6466
J. Marshall Reber
groschen1936
Jul 7, 2006 3:50 pm
... I have finally gotten around to reading these "American Heritage® Book of English Usage" paragraphs and wish to point out they use poor, i.e. ... Remember...
6469
Robert Merkin
jameskpolka
Jul 9, 2006 2:09 am
For the mere enjoyment of electrocuting insects, I can offer my unsolicited testimonial. Big moths put on the best and noisiest show. Get ready to be truly...
6471
GEOelectronics
K0FF
Jul 9, 2006 2:58 pm
It's an ion chamber on a stick. They use them to probe 'phantoms" to see how much radiation is getting to the target area. Geo ... From: Tornadojoe To:...
6472
Lenox Carruth
ww_ii_collector
Jul 9, 2006 5:34 pm
Years ago, when I was in graduate school, I transistorized a PRI 107C and a PRI 111B. I made a printed circuit board that was the same size as the original...
6473
Bill Beamon
kd4fnc
Jul 9, 2006 6:15 pm
Does anyone have schematics on the Minimonitor II or 125 pocket GCs? Anything on the XETEX 415 dosimeter? Thanks in advance.... Bill Beamon KD4FNC bbeamon -at-...
6475
troglodite@...
injuneer314159
Jul 10, 2006 6:42 pm
Ken, Sounds like a bargain. Do you have a PayPal account? If so, I'll take it now, if not I'll still take it but will have to clear it with my better half. ...
6478
wharpt@...
wharpt1
Jul 11, 2006 12:49 am
Anybody know which Gamma tracer isotope hospitals use to track white blood cells?...
6479
coketaylor@...
sciradioactive
Jul 11, 2006 1:44 pm
I don't know if this is what you are talking about but hospitals use I-131 for therapy when they tag white blood cells with I-131. It is called Monoclonal ...
6480
Tornadojoe
tornadojoe1974
Jul 11, 2006 10:05 pm
Does the speaker on the Ludlums have any special Circuit driving it? for what it is,It sure is loud....
6481
wharpt@...
wharpt1
Jul 12, 2006 4:15 am
In a message dated 7/11/06 8:44:41 AM Central Daylight Time, coketaylor@... writes: I don't know if this is what you are talking about but hospitals use...
6482
Robert Atkinson
robert8rpi
Jul 12, 2006 12:40 pm
Hi, Nearly all the Ludlum handheld units use a "Unimorph"; piezo-ceramic sounder. Generally (e.g. models 12 and 16) driven by a '555 timer wired as a pulse...
6483
GEOelectronics
K0FF
Jul 12, 2006 3:37 pm
I-131 is a strong Gamma emitter, with over 81% probability of a 364 keV gamma per disintegration. Radiological half life is 8 days. The biological half life...
6485
wharpt@...
wharpt1
Jul 12, 2006 4:13 pm
Geo, with all due respect, ain't NO way! I'm gonna collect a urine sample! Thanks anyway! Wharpt ... From: GEOelectronics@... To:...
6486
GEOelectronics
K0FF
Jul 12, 2006 4:56 pm
And you call yourself a scientist!? Geo ... From: wharpt@... To: GeigerCounterEnthusiasts@yahoogroups.com Sent: Wednesday, July 12, 2006 11:03 AM Subject:...
6487
Chris Smolinski
lastoneouttu...
Jul 12, 2006 5:17 pm
Then you don't want to know how doctors in the 18th century checked for sugar in urine. ;-) ... -- ... Chris Smolinski Black Cat Systems ...
6488
GEOelectronics
K0FF
Jul 12, 2006 5:53 pm
That's nothin'. In India there is a whole cult that drinks all their urine, all the time (Urophagia). No kidding Ghandi was one of the practitioners so was...
6489
wharpt@...
wharpt1
Jul 13, 2006 12:07 am
No. In a message dated 7/12/06 11:58:36 AM Central Daylight Time, GEOelectronics@... writes: And you call yourself a scientist!? Geo ... From:...
6490
GEOelectronics
K0FF
Jul 13, 2006 12:16 am
After today I'll be taking a break from the eBay scene long enough to get the Home Lab reorganized. If anyone has an open order for LENi's, GEO-210 probes or...
6491
GEOelectronics
K0FF
Jul 13, 2006 12:32 am
me neither, just a wannabee. Geo ... From: wharpt@... To: GeigerCounterEnthusiasts@yahoogroups.com Sent: Wednesday, July 12, 2006 6:52 PM Subject: Re:...
6492
Duane Goff
opointe
Jul 13, 2006 3:55 pm
I am researching Geiger Counters, GM tubes and scintillators for prospecting hot rocks and ran across this posting by Franklin Roberts <...
6493
GEOelectronics
K0FF
Jul 13, 2006 5:11 pm
Yes, the Ludlum 2241 series, FWT-Cypher5000 and Eberline 600 also have audio divide, but a better way to run mobile is with an alarming meter, run off the...
6494
GEOelectronics
K0FF
Jul 13, 2006 5:38 pm
The HOME LAB series by George Dowell Chapter 1 Hardware The Home Rad Lab - The Nuclear Physics Wing Intro Radioactivity in the educational lab. What is legal? ...
6495
Duane Goff
opointe
Jul 13, 2006 5:40 pm
Thanks Geo for the info and all you do! ... divide, but a better way to run mobile is with an alarming meter, run off the battery. See the FILES section for...
6496
Steve Jones
cornbread_fred
Jul 13, 2006 9:27 pm
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250005338686&fromMakeTrac k=true Nope, I'm not the buyer or seller. Steve Jones...
