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Technical Development

ScienceAsia 7 (1981): 110-122 |doi: 10.2306/scienceasia1513-1874.1981.07.110

 

A SIMPLE LEADING EDGE DISCRIMINATOR FOR THE ASSOCIATED-GAMMA RAY TIME-OF-FLIGHT EXPERIMENT

 

S. SINGKARAT, P. SAWAWIBUL,a T. VILAITHONOb and G.HOYES

ABSTRACT: A simple tunnel diode leading edge discriminator has been constructed for use as a time pickoff device with a NaI(Tl) scintillator in an associated.gamma ray time-of-flight measurement. When using a 2"x2" NaI(Tl) and a 2"x2" fast plastic scintilla. tors NE102 as detectors of the fast coincidence system, it is found that the timing resolution of the system is 6.1 nsec(FWHM) for a 10:1 dynamic range using 60Co radioactive source. The system was checked by measuring the spectrum of neutrons emitted in coincidence with gamma rays from Am-Be source. Details of circuit descriptions and experimental measurements are described in this paper.

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Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mait Thailand.
a Present address: Department of Physics, Songkhla Teachers College, Songkhla.
b To whom correspondence should be addressed.

Received 14 April 1981