RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Dose Rate Determination of a High 60Co γ-Ray Field (3.7 (kC kg-1) /h)
Takao YAMAMOTOTokuhiro OHNISHITamotsu KANAZAWAShinichi OKAMOTOEiichi HIRAOKA
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1987 Volume 36 Issue 3 Pages 129-132

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Abstract

The highest 60Co γ-ray field available in Radiation Center of Osaka Prefecture was determined employing a cylindrical cavity chamber which has been calibrated with the national standard up to 7.7 (C kg-1) /h (30 kR/h) . For higher exposure rate regionn four stage of calibrations were carried out up to 3.7 (kC kg-1) /h (14 MR/h), which is higher than ever reported, based on the additivity of gamma intensity in terms of the source activity. The errors accompanied with the resultant values were estimated as 6% at most. Axial dose rate distributions in the irradiation cans used in the irradiation pool were measured with PMMA dosimeters.

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© Japan Radioisotope Association
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