EXTENDED AND POINT SOURCE RADIOMETRIC PROGRAM
Technical Report
·
OSTI ID:4778837
An extended-source calibration area was set up in the Nevada Test Site area to encourage a standarnization of airborne radiometric instrumentation among several government agencies and private companies. A simulated plane-source array was laid out with positions at 100-ft intervals in the form of a square 2000 ft on a side. For gound measurements a smaller square array of 100 positions at 10-ft intervals was placed in the center of the large array. Two sets of sources were used in the array. Co/sup 60/ and Cs/sup 137/ sources of 4.5 and 15 mc, respectively, were available for the large array and sources one hundredth of these values in the smaller array. Point sources of Co/sup 60/, Cs / sup 137/, and I/sup 131/ of the order of 2 curies each were available for comparison with the area sources. Measurements 3 ft above the area sourccs indicated 200 mu r/hr for Co/sup 60/ and 225 mu r/hr for Cs/sup 137/. Four government agencies and one private company participated in an intercalibration exercise. Various types and sizes of aircraft from a Cessna 172 to a Douglas DC- 3 were used. Various instrumentation devices, mostly scintillation type deteciors, were tested. Flights ranging from 100- to 1000-ft altitude included background measurements, instrument calibration, intercalibration, proof-te sting equipment, comparison of point- and area-source measurements, measurements of air attenuation and buildup of gamma radiation, and gamma-ray spectral measurements. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.; Division of Biology and Medicine, AEC
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-16-029099
- OSTI ID:
- 4778837
- Report Number(s):
- CEX-60.3
- Country of Publication:
- United States
- Language:
- English
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