Measurement evaluation of -rays tissue absorbed dose rate in -ray reference fields made by PTB

Shimizu, Shigeru; Nemoto, Hisashi*; Kajimoto, Yoichi; Tatebe, Yosuke; Takahashi, Hiroshi*

We were researched and developed in German federal physical engineering laboratory (PTB) and established the standard field of the ray tissue absorbed dose rate corresponding to Series 1 of ISO6980-1(2006) to the Facility of Radiation Standard of Japan Atomic Energy Agency (JAEA) in February, 2010. We measured ray tissue absorbed dose rate of this standard field using an extrapolation ionization chamber made in PTB. By the comparison between this result and standard value of PTB, both agreed well. In this announcement, we speak these evaluation results and comparison result. In addition, we speak that the ray tissue absorbed dose rate at the time of the standard field use comes under a big influence by a change of the air density of the examination environment.