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
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
- Resource Relation:
- Conference: 19. midyear topical symposium on health physics considerations in decontamination and decommissioning, Knoxville, TN, USA, 2 Feb 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
54 ENVIRONMENTAL SCIENCES
COMPARATIVE EVALUATIONS
IONIZATION CHAMBERS
NAI DETECTORS
REMEDIAL ACTION
MEASURING INSTRUMENTS
ALTITUDE
RADIOACTIVITY
RADIUM 226
SOILS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
RADIUM ISOTOPES
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
YEARS LIVING RADIOISOTOPES
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
054000 - Nuclear Fuels- Health & Safety
510302 - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- Terrestrial Ecosystems & Food Chains- (-1987)