LARGE PLASTIC SCINTILLATORS FOR RADIOACTIVITY MEASUREMENT
This study of counting systems utilizing large plastic scintillators includes an investigation of the component parts, the gamma spectra obtained from large scintillators, and the application of large scintillators to total- body and lowlevel sample counting. Properties of the component parts investigated included light production from plastic scintillators of different manufacture, the influence of crystal size and shape on light collection efficiency, and the photocathode response of 5-in. and 16-in. photomultiplier tubes. Experimental spectra tsken with a 16-in. diameter by 8-in. thick cylinder of plastic are shown and the results for 0.662 Mev gamma rays compared to a calculated pulse-height distribution. The application of large plastic scintillators to total-body counting is evaluated by comparing the response of an array of 16-in. by 8-in. plastic scintillators to a single 8-in. by 4-in. NaI detector. Spectra taken with an 18-in. by 18-in. plastic well counter are presented, and data are presented on the performance of this device as a low- level sample counter. (auth)
- Research Organization:
- Massachusetts General Hospital, Boston
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-020878
- OSTI ID:
- 4089402
- Journal Information:
- Health Physics (England), Vol. Vol: 5; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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