REQUIREMENTS FOR MILITARY RADIACS. 2. EFFECT OF THE OPERATOR ON THE ENERGY- DIRECTIONAL RESPONSE OF PORTABLE RADIATION INSTRUMENTS
Technical Report
·
OSTI ID:4066603
Results are presented of experiments designed to determine the response of selected military high-range radiacs to extended gamma radiation fields with and without a phantom (simulated operator). The IM-125/PDR-43, IM-153/PD, IM- 108A/PD, PDR-63 (USNRDL prototype), and DT-60 (XN-2)/PD were tested with point sources of radiation with energies of 70, 120, 180 kev (eff), 667 kev (/sup 137/ Cs), and 1170, 1330 kev (/sup 60/Co) at radiation intensities in the range 1 to 5 r/hr. Assuming that response of these radiacs to extended-field radiation sources can be inferred from their response to multilateral point sources at specific angles of elevation and over 380 deg of arc, it was found that response to radiation back-scattered from the operator compensates for decrease in response due to body (operator' s) attenuation to an extent determined by type of radiac, carrying mode, and radiation energy. The presence of the operator has little effect on the response of the IM-12S/PDR-43. Extended-field response of the IM-153/PD, IM-108A/PD, PDR-63, and DT-60(XN-2)/PD are all substantially decreased by the presence of the operator in varying degree, dependent on radiac type and radiation energy. Using present calibration methods, the net effect of the operator is to cause all of radiacs tested, except the DT-60(XN-2)/PD, to indicate about 0.75 of the true free-field radiation dose rate or dose. When worn by an operator, the DT-60(XN-2)/PD indicates about 0.65 of the free-field dose. These results are probably typical of portable radiation detection instrument response to extended fission product fields when held by an operator. (auth)
- Research Organization:
- Naval Radiological Defense Lab., San Francisco
- NSA Number:
- NSA-18-016309
- OSTI ID:
- 4066603
- Report Number(s):
- USNRDL-TR-701; AD-431548
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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