In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.
Subject: Re: X-ray film detector
Date: Oct 03, 8:52 am
Poster: Richard Hull
On Oct 03, 8:52 am, Richard Hull wrote:
You are probably generating second order particles with the alpha particles bobarding the paper, plastics and foils.... Recoil protons, xrays, scattered electrons, etc. The Am241 puts out a potent alpha.
There are neutron emulsions as some of my books mention, but they rely mainly on proton recoil.
Try putting the source with the neutron goodie about 1"-2" from the film. This will now pretty much only see the neutrons alone as the mean free path for the charged recoil and scatter components in air is very short.
>I am trying to use dental X-ray film as a detector for neutrons. (Yes I am a dentist by profession)
>I scavanged some Am 241 from some old smoke detectors to try and produce a neutron source.
>I used a layer of LiF over the alpha source then placed this over the X-ray film for a few hours.
>In fact I did a number of tests and all produced an exposure? I tried various combinations of layers of LiF Pb and B to try and tell if I was producing neutrons.
>The following are some combinations that were used:
>1. Am241 source on X-ray film (note: film is encased in paper covered with plastic)
>2. Am 241 LiF and Al foil on X-ray film
>3. Am 241 Lif and Al Foil Pb foil Boron then X-ray Film
>4. Am 241 on Pb foil on X-ray film.
>All arrangements produced an image on the film after 6 hours of exposure. The only noted difference was the films with a Pb foil between the source and film produced an image that was a little lighter than the others.
>I was trying to produce neutrons with the LiF and the alpha source, then fire them through the lead foil, then detect them with the boron and expose the film.
>The film is encased in carbon and hydrogen basically ( paper and plastic )
>I didn't expect to get images from all the films??
>What type of reaction am I getting with the Am 241 on the X-ray film alone? And why does this reaction appear to go through lead foil? Any suggestions or guesses as to what is happening here?
>What is the easiest way to detect neutrons using these materials?