Comparison of the response of a NaI scintillation crystal with a pressurized ionization chamber as a function of altitude, radiation level and Ra-226 concentration
Conference
·
OSTI ID:6142987
The Grand Junction Uranium Mill Tailings Remedial Action-Radiological Survey Activities Group (UMTRA-RASA) program employs a screening method in which external exposure rates are used to determine if a property contaminated with uranium mill tailings is eligible for remedial action. Portable NaI detectors are used by survey technicians to locate contaminated areas and determine exposure rates. The exposure rate is calculated using a regression equation derived from paired measurements made with a pressurized ionization chamber (PIC) and a NaI detector. During July of 1985 extensive measurements were taken using a PIC and a NaI scintillator with both analogue and digital readout for a wide range of exposure rates and at a variety of elevations. The surface soil was sampled at most of these locations and analyzed for /sup 226/Ra. The response of the NaI detectors was shown to be highly correlated to radiation level but not to /sup 226/Ra concentration or elevation.
- Research Organization:
- Colorado State Univ., Fort Collins (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6142987
- Report Number(s):
- CONF-860203-10; ON: DE86006211
- Country of Publication:
- United States
- Language:
- English
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