Search found 8 matches

by Kai Kaletsch
Sun Jan 27, 2019 9:01 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Calibrating a Neutron Detector With Background Neutrons
Replies: 1
Views: 2005

Calibrating a Neutron Detector With Background Neutrons

The thermal neutron fluence rate at the earth's surface is well known and we should be able to use that as a way to get an approximate calibration for neutron detectors. This video proposes a method: https://www.youtube.com/watch?v=OahvY0gc0Cc&feature=youtu.be The thermal neutron fluence at the refe...
by Kai Kaletsch
Sat Jan 19, 2019 2:12 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 10
Views: 4567

Re: Neutron Detector and Moderator Test

Here is an update on this project: We did some more tests on this neutron detector. It turns out that the efficiency was not that great and most of the background counts were not from neutrons. Burying the detector in Borax didn't remove the background. That means that most of the background was fro...
by Kai Kaletsch
Thu Nov 01, 2018 1:18 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 10
Views: 4567

Re: Neutron Detector and Moderator Test

John, I totally agree that that's how it should be done. The problem is that I don't have access to relevant reference instruments and was hoping to get feedback on whether I'm in the right ballpark before I spend too much money. Around here, everyone has several Rem Balls but nobody has just a bare...
by Kai Kaletsch
Thu Nov 01, 2018 12:54 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 10
Views: 4567

Re: Neutron Detector and Moderator Test

Justin, Thank you very much for pointing out the rejection on pg 32. I haven't had time to look through the whole thing and was used to just breezing through the PCT process with my other patent ( https://patents.google.com/patent/US8766201 ). I'll have to look at this in more detail. Again, thanks ...
by Kai Kaletsch
Thu Nov 01, 2018 3:21 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 10
Views: 4567

Re: Neutron Detector and Moderator Test

Thanks for the suggestions, Dan. All good points. Yes, the video doesn't show gamma response. But, I'm pretty sure we are fairly blind to gamma. We tested it on some of our own sources and also had the neutron detector right up to the gamma source on the Troxler gauge and opened the shield and it ma...
by Kai Kaletsch
Thu Nov 01, 2018 12:28 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 10
Views: 4567

Re: Neutron Detector and Moderator Test

I'd like to get some feedback from people who have looked into neutron detectors on how this compares to other neutron detectors out there. Is it good, bad or ugly, compared to other methods? I've looked around and I think that it compares pretty well. But, this is my baby and I might be deluding my...
by Kai Kaletsch
Mon Oct 29, 2018 4:33 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 10
Views: 4567

Re: Neutron Detector and Moderator Test

I believe the gauge is a Troxler 3430 ( https://www.troxlerlabs.com/downloads/pdfs/3430/3430manual.pdf ). Radiologically, it is pretty benign. Radiation levels are given on page A9 of the pdf. According to the manual, operators are usually not considered radiation workers. The 40 mCi (1.48 GBq) is t...
by Kai Kaletsch
Sat Oct 27, 2018 6:04 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 10
Views: 4567

Neutron Detector and Moderator Test

I put my neutron detector about 50 cm from a soil moisture gauge, containing 40 mCi AmBe, and recorded the results with various moderator thicknesses and got between 38 and 166 cpm. I don't know if there is any neutron shielding along the side of the gauge and didn't think of it when I had the chanc...