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Nuclear Data Tables
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The Effect of Collimation on the Resolution and Peak-to-total Ratio of a NaI(T1) Crystal
Restricting the incident radiation to a small area of a Na(T1) scintillation crystal improves the resolution and peak-to-total ratio of the spectrometer. This effect was studied with a series of tapered lead collimators, all with the same apex but with differing apertures, in front of a 4 in. by 4 in. diameter NaI(T1) scintillation crystal. Sources of gamma rays with energies from 0.28 to 2.76 Mev were located at the apex of the taper. Optimum resolution of about 25 percent greater than broad-beam resolution was obtained with a 0.25-in. diameter aperture. Anomalous effects were observed with a smaller opening. (Author).
TR.
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New Nuclear Data
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