Dual energy analysis using phoswich scintillation detectors for low-level in-vivo counting
From nuclear science symposium; San Francisco, California, USA (14 Nov 1973). Electronics developed for a whole body counting system analyze the pulse heights of signals from both the sodium iodide (NaI(Tl)) and cesium iodide (CsI(Na)) crystals of a phoswich scintillation detector. Pulse shape discrimination is used to determine the origin of the scintillation, NaI or CsI, while rejecting coincident Compton-scattered events and photomultiplier tube noise. Both energy spectra are accumulated simultaneously in separate memory quadrants of a multichannel analyzer. The system allows for low-energy (5 keV to 125 keV) x-ray analysis from the NaI(TI) crystal and high-energy (100 keV to 2.5 MeV) x-ray or gamma -ray analysis from the CsI(Na) crystal. The discrimination system is better than 95% efficient over both energy ranges, with a lowenergy (12- 24 keV) shielded background count of less than 2 cpm for a single 5-in.-diam phoswich detector. This system thus extends the detector's normal energy range by more than an order of magnitude. (auth)
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- NSA Number:
- NSA-29-007749
- OSTI ID:
- 4386993
- Report Number(s):
- UCRL-74797; CONF-731112-12
- Resource Relation:
- Conference: Nuclear science symposium, San Francisco, California, USA, 14 Nov 1973; Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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