Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Signals in He-3 detector

  1. Feb 16, 2016 #1
    Does all the signals detected by He-3 detector caused by neutrons?
    When the He(n,p)t reaction occurs, will proton cause any secondary x-ray photons since it de-accelerates in matter.
  2. jcsd
  3. Feb 21, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
  4. Feb 21, 2016 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    Think about the ionization energies of hydrogen (13.6 eV) and helium (1st 24.6 eV, 2nd 54.4 eV) so they will be UV or very soft X-rays, which would not ionize He atoms. Look at the emission or line spectra of H and He.

    The combined energy of the p and t is the Q-value, 764 keV, with 573 keV to the proton and 191 keV to the triton). When they neutralize, the photons from them (t,p) are quite low in energy. More energetic gamma-rays and X-rays can originate in the metal wall or anode of the detector, if the t or p hit the anode or wall, and of course, they can originate from outside the detector.

    Neutron detectors, including He-3: http://web.mit.edu/8.13/www/JLExperiments/38/tgm-neutron-detectors.pdf

    Read up on gas-filled proportional counters and their sensitivity, or insensitivity, to X-rays and gamma-rays.



    Gamma-ray detectors - http://www.lanl.gov/orgs/n/n1/panda/00326398.pdf
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook