By Topic

A Multicrystal Gamma-Ray Spectrometer with Time-of-Flight Rejection of Neutron-Induced Background

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
R. J. Scroggs ; Oak Ridge National Laboratory ; W. Zobel ; F. C. Maienschein

To improve the rejection of neutron-induced background in a multicrystal gamma-ray spectrometer, nanosecond circuitry was designed that exploits the difference in flight times of neutrons and gamma rays produced in a target bombarded with a pulsed beam of monoenergetic protons. This circuitry allows the spectrometer to be gated on for a time (nominally 7 nsec) equal to the pulse width of the proton beam. Only those gamma rays produced during the proton pulse are accepted for energy analysis. These gamma rays arrive at the detector in a time short compared with the flight time of any other secondary radiation produced during that same beam pulse. The system. is used as a pair spectrometer for energies from 1.5 to 11 Mev, and as a total absorption spectrometer for energies below 2.5 Mev. The energies of the gamma rays produced by 160 Mev protons from the Harvard University synchrocyclotron in targets of Be, C, H2O, Al, Co, and Bi were measured. Spectral data were obtained and the results include determination of essentially all the gamma rays reviously described plus several more at higher energies. The neutron rejection ratio of the spectrometer varied with targets and ranged from 59% for C to 77% for H2O.

Published in:

IEEE Transactions on Nuclear Science  (Volume:11 ,  Issue: 1 )