In situ gamma-ray measurement using Ge(Li) detectors

Conference · Sat Jan 31 23:00:00 EST 1976 · IEEE Trans. Nucl. Sci., v. NS-23, no. 1, pp. 726-733

OSTI ID:4043965

Sakai, E; Terada, H; Katagiri, M

A portable 73 cm$sup 3$ closed-end coaxial Ge(Li) gamma-ray spectrometer was made and in-situ measurement of environmental gamma-rays has been carried out. The detector has 17.5 percent peak detection efficiency and 2.5 keV FWHM energy resolution for 1333 keV gamma-rays at a source-to-detector distance of 25 cm. The peak counting rate per unit flux of 662 keV gamma-rays was 3.62 cps/photon/ cm$sup 2$ sec and FWHM was 2.1 keV. Peak counting rate dependence on incident direction of parallel beam of gamma-rays was measured to find correction factors for in-situ data analysis. From the in-situ measurements, the concentrations of $sup 238$U, $sup 232$Th, $sup 40$K, and $sup 137$Cs in the soil and their contributions to the total exposure rate at the detector were induced. These results are compared with those of low level Ge(Li) spectrometer measurement of soil samples and with those of in-situ measurement using a 3'' x 3'' NaI(Tl) detector spectrum-to-dose conversion operator method. Another Ge(Li) detector having a special lead shield was made to detect only gamma-rays from plumes. (auth)

• Research Organization: Japan Atomic Energy Research Inst., Ibarakiken
• NSA Number: NSA-33-029369
• OSTI ID: 4043965
• Journal Information: IEEE Trans. Nucl. Sci., v. NS-23, no. 1, pp. 726-733, Journal Name: IEEE Trans. Nucl. Sci., v. NS-23, no. 1, pp. 726-733; ISSN IETNA
• Country of Publication: United States
• Language: English

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*CESIUM 137-- RADIOMETRIC ANALYSIS
*GAMMA SPECTROMETERS-- DESIGN
*LI-DRIFTED GE DETECTORS-- DESIGN
*NATURAL RADIOACTIVITY-- RADIOMETRIC ANALYSIS
*POTASSIUM 40-- RADIOMETRIC ANALYSIS
*RADIOACTIVE EFFLUENTS-- RADIATION MONITORING
*SOILS-- RADIOMETRIC ANALYSIS
*THORIUM 232-- RADIOMETRIC ANALYSIS
*URANIUM 238-- RADIOMETRIC ANALYSIS
440103* --Instrumentation--Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
COUNTING RATES
EFFICIENCY
ENERGY RESOLUTION
N40130 --Chemistry--Analytical & Separations Chemistry--Radiometric & Radiochemical Procedures
N44310 --Environmental & Earth Sciences--Radioactivity Monitoring & Transport--Atmosphere
N44320 --Environmental & Earth Sciences--Radioactivity Monitoring & Transport--Soil
N46130* --Instrumentation--Radiation Detection Instruments-- Nuclear Spectroscopic Instrumentation
PERFORMANCE
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