Personal Dosimetry in Direct Pulsed Photon Fields with the Dosepix Detector

TL;DR

This study evaluates the Dosepix detector's dosimetric performance in pulsed photon fields, analyzing its response to varying pulse durations and dose rates, and comparing results to legal dose limits.

Contribution

It provides new insights into the Dosepix detector's response characteristics in pulsed photon fields, including pulse duration and dose rate effects, with potential applications in personal dosimetry.

Findings

Flat response around 1.0 for pulse durations from 3.6s to 2ms.

Small pixels remain within dose limits up to 704 Sv/h.

Count rate saturates at high dose rates, confirming previous results.

Abstract

First investigations regarding dosimetric properties of the hybrid, pixelated, photon-counting Dosepix detector in the direct beam of a pulsed photon field (RQR8) for the personal dose equivalent $H\mathrm{_p(10)}$ 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 about 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$\,$Sv/h to 35$\,$Sv/h for both pixel sizes. Above this dose rate, the large pixels (220$\,\mu$m edge length) are below the lower limit. The small pixels (55$\,\mu$m 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.