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- Title
A standard for absorbed dose rate to water in a 60Co field using a graphite calorimeter at the National Metrology Institute of Japan.
- Authors
Morishita, Y; Kato, M; Takata, N; Kurosawa, T; Tanaka, T; Saito, N
- Abstract
A primary standard for the absorbed dose rate to water in a ⁶⁰Co radiation field has been newly established at the National Metrology Institute of Japan. This primary standard combines the calorimetric measurements using a graphite calorimeter with the ionometric measurements using a thick-walled graphite cavity ionisation chamber. The calorimeter is operated in the constant temperature mode using AC Wheatstone bridges. The absorbed dose rate to water was determined to be 12 mGy s⁻¹ at a point of 1 m from the radiation source and at a water depth of 5 g cm⁻². The uncertainty on the calibration coefficient in terms of the absorbed dose to water of an ionisation chamber using this standard was estimated to be 0.39 % (k=1).
- Publication
Radiation protection dosimetry, 2013, Vol 154, Issue 3, p331
- ISSN
1742-3406
- Publication type
Journal Article
- DOI
10.1093/rpd/ncs235