SCINTILLATION SPECTROMETER WITH SUMMATION OF PULSES FROM TWO CRYSTALS
A two-crystal scintillation spectrometer, based on the principle of summation of amplitudes of pulses from two detectors is described. A gamma quantum which experiences Compton scattering in one crystal, falls into a second crystal, placed in line with the first one, and is absorbed there because of the photoeffect. With the aid of a coincidence circuit. the pulses corresponding to simultaneous registration of the gamma quantum in both crystals are selected. The amplitude of the summary pulse is proportional to the energy of the primary radiation. The use of such a spectrometer makes it possible, through reducing the background owing to Compton scattering, to measure spectra with a large number of gamma transitions. An effect analogous to the addition of pulses in Compton scattering of gamma quanta is observed in pair production when one or both annihilation quanta leave the first crystal and are absorbed in the second. The efficiency of the spectrometer is measured for two values of the gamma - quantum energy: at E/sub gamma / = 0.661 Mev, n = 3.3% (resolution 12.3%) and at E = 1.225 Mev, n = 1.8%. The most convenient geometric placement of the crystals, ensuring the maximum effectiveness of the spectrometer, is discussed.
- Research Organization:
- Inst. of Nuclear Physics, Prague
- NSA Number:
- NSA-14-024277
- OSTI ID:
- 4144136
- Journal Information:
- Ceskoslov. casopis pro fysiku, Journal Name: Ceskoslov. casopis pro fysiku Vol. Vol: 8
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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