To assess the effectiveness of plastic phosphors in the reduction of Compton effect in scintillation spectrometers, a spectrometer with a small NaI(Tl) crystal surrounded by a large plastic phosphor has been constructed. The output from the plastic phosphor is put in anticoincidence with the output from the NaI(Tl) crystal. A reduction of Compton contribution in the scintillation spectrum to about 35% of original value is obtained. Comparison of results with, and without, the shield enables certain spectral features to be identified. Possible applications are discussed. Transistor anticoincidence circuits are used.
REFERENCES
1.
P. R. Bell in Beta‐ and Gamma‐ray Spectroscopy, Editor K. Siegbahn (Interscience Publishers, Inc., New York, 1955), pp. 138, 155.
2.
3.
Harshaw Chemical Company, Cleveland, Ohio.
4.
Nuclear Enterprises Ltd., Winnipeg, Canada.
5.
6.
For a general treatment of transistor trigger circuits see
A. W.
Lo
, Proc. Inst. Radio Engrs.
, 40
, 1531
(1952
).7.
Other work on transistor coincidence circuits will be published later.
8.
Advance Electronics Company, Inc., Passaic, New Jersey, No. 507.
9.
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© 1956 American Institute of Physics.
1956
American Institute of Physics
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