Personal Dosimetry in Direct Pulsed Photon Fields with the Dosepix Detector

Abstract

First investigations regarding dosimetric properties of the hybrid, pixelated, photoncounting Dosepix detector in a pulsed photon field (RQR8) for the personal dose equivalent Hp(10) are presented. The influence quantities such as pulse duration and dose rate were varied, and their responses were compared to the legal limits provided in PTB-A 23.2. The variation of pulse duration at a nearly constant dose rate of 3.7 Sv/h shows a flat response around 1.0 from 3.6 s down to 2 ms. A response close to 1.0 is achieved for dose rates from 0.07 mSv/h to 35 Sv/h for both pixel sizes. Above this dose rate, the large pixels (220 µm edge length) are below the lower limit. The small pixels (55 µm edge length) stay within limits up to 704 Sv/h. The count rate linearity is compared to previous results, confirming the saturating count rate for high dose rates.