Search found 142 matches

by George Dowell
Sat Sep 07, 2019 5:03 pm
Forum: Items For Sale
Topic: Check source for setting up BF3-He3 etc tubes. USA /pickup only.
Replies: 0
Views: 342

Check source for setting up BF3-He3 etc tubes. USA /pickup only.

Professionally made. $1900
Pickup in NE Missouri.

George Dowell
GEOelectronics@rallstech.net

also I have about 800 pounds of 2" thick HDPE moderator material for sale for neutron ovens or large scale detectors.
by George Dowell
Mon Oct 05, 2015 5:02 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Bubble vs. Quantrad Ranger Plus
Replies: 15
Views: 6197

Re: Bubble vs. Quantrad Ranger Plus

I'll have to look it up, it's been maybe 10 years since my work with that.

Meantime do a gamma scan of Cs-137 and show me the screen. Specifically where does the 661.7 peak show up?

Thanks
by George Dowell
Tue Jul 14, 2015 7:12 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Bill Kolb's TRINITITE The Atomic Age Minearl is out.
Replies: 1
Views: 1888

Bill Kolb's TRINITITE The Atomic Age Minearl is out.

Got mine yesterday, a good read. Get one.

George Dowell
by George Dowell
Mon Jul 13, 2015 4:12 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Bubble vs. Quantrad Ranger Plus
Replies: 15
Views: 6197

Re: Bubble vs. Quantrad Ranger Plus

You can send it to a calibration lab that has the necessary source. It should not cost more than $200.00 plus shipping both ways. The calibration should be good for several years as long as the instrument is treated gently. I find that the sodium iodide detector part of the Quantrad Ranger needs ca...
by George Dowell
Sun Jul 05, 2015 6:38 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: NAA Tungsten
Replies: 15
Views: 5715

Re: NAA Tungsten

Electronci drift is there, to be sure and this is due to the A to D converters. This is taken up and corrected for by using a check source each data accumulation session to adjust your amplifier detection threshold and or gain to center the check source's known peak precisely prior to running an un...
by George Dowell
Sun Jul 05, 2015 4:08 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: NAA Tungsten
Replies: 15
Views: 5715

Re: NAA Tungsten- @5 Half-Lives

Two 12 hour scans, separated by 5 half-lives in time, subtracted from one another. The first scan was the baseline activity, taken as soon as the sample was available and was loaded as "LIVE SPECTRUM" to make this picture. For 5 more days, another 12 hour scan was taken and saved. Activity at the 5 ...
by George Dowell
Sat Jul 04, 2015 9:29 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: NAA Cobalt Alloy
Replies: 0
Views: 1388

NAA Cobalt Alloy

WellCap.pdf WellCap.pdf ContainerclosedSmall.jpg see pdf attached. WellCap.pdf “Dear GEOelectronics, I have a fishing head cap for an Am241Be (10Ci) well logging source, 348cpm at 1cm. Remind me of your address and I'll send it off. I'd love to know what you find out about it." Background of the de...
by George Dowell
Sat Jul 04, 2015 5:20 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: NAA Tungsten
Replies: 15
Views: 5715

Re: NAA Tungsten

Very nice work George... nice clean spectra. What are you using as a neutron source? Jon Rosenstiel Hi Jon. More to come but the working conditions in a nutshell were/are: Target- 70g WC (tungsten carbide) tool part. Source- isotopic @20e8 n/s (11/2014), distance 5”". Moderator- 2"” 200 series S.S....
by George Dowell
Thu Jul 02, 2015 4:12 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: NAA Tungsten
Replies: 15
Views: 5715

Re: NAA Tungsten update: 4 half-lives later

picture shows the first 12 hour scan and another 12 hour scan after 4 Days= 4 half lives of W-187.



George Dowell
by George Dowell
Wed Jul 01, 2015 10:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Trouble Obtaining Deuterium
Replies: 10
Views: 4647

Re: Trouble Obtaining Deuterium

" Heavy water is rather easy to get and about 50 cents/ gram-cc, "

or 1.11 g/cc


George Dowell