NDLI: A sectioned spectrometer of fast neutrons

Content Provider	Springer Nature Link
Author	Nico, J. S. Veretenkin, I. E. Thompson, A. K. Shikhin, A. A. Mustafin, M. F. Abdurashitov, D. N. Yants, V. E. Matushko, V. L. Gavrin, V. N.
Copyright Year	2009
Abstract	Development of a capture gated spectrometer on the basis of a liquid organic scintillator doped with enriched $^{6}$Li is discussed. Particular interest is evoked by the good pulse height resolution of the spectrometer for 14-MeV neutrons, which is expected to be very high, ∼10–15%. This resolution is attained by compensating for the nonlinearity of the light yield in the scintillator owing to the use of separate optically isolated sections, which independently detect scintillations from each recoil proton. The detector is sensitive to fluence rates ranging from 10$^{−4}$ to 10$^{2}$ cm$^{−2}$ s$^{−1}$ above a threshold of 500 keV under conditions of uncorrelated γ-ray background at a level of up to 10$^{2}$ s$^{−1}$ (E > 100 keV). A pilot model of the detector based on a scintillator without a lithium dopant has been produced and tested. The detector efficiency is governed by the scintillator volume (∼1.2 l); for 3-MeV neutrons, its value is 0.2–0.5%. The response of the pilot detector to neutrons from a Pu-α-Be source with energies of up to 10 MeV has been measured. Initial testing indicates a low threshold at an ∼600-keV energy of a recoil proton. A good spectral response is obtained using the criterion that three optical sections of the detector operate at a time. This spectrometer can find application in low-background experiments in basic physics research, as well as in space research and nuclear medicine for measuring the parameters of the neutron flux.
Ending Page	32
Page Count	8
Starting Page	25
File Format	PDF
ISSN	00204412
e-ISSN	16083180
Journal	Instruments and Experimental Techniques
Issue Number	1
Volume Number	52
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-02-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Measurement Science, Instrumentation Physical Chemistry Electrical Engineering
Content Type	Text
Resource Type	Article
Subject	Instrumentation

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