Radiation measurements and simulations at the PHELIX laser facility, GSI

Abstract

The absolute spectral electron and photon emission from a Tungsten target irradiated by the Petawatt High-Energy Laser for Heavy Ion EXperiments (PHELIX) facility was measured inside the PHELIX target chamber. For this, a thermo-lumi-nescence detector (TLD)-based few-channel spectrometer (FCS) was used in combination with a Bayesian data analysis. The results of the FCS measurement served as input for a Monte-Carlo particle transport simulation to determine the spectra and dose out of the PHELIX target chamber. Two different simulation methods proved to be consistent and, therefore, reliable. The simulation results were compared to the dose measured with a dosemeter that consists of three Dosepix detectors in combination with a neural network analysis. The two dose results show a satisfactory agreement.

Dose estimation in X-ray backscatter imaging with Timepix3 and TLD detectors

“…This detector type has demonstrated effectiveness under high dose rates [10] and could be employed to characterize the dose produced by the backscattering scanner and verify this study's findings. A similar comparison as the one proposed has been done in [11], but without direct dose measurement with the Timepix3 and in a mixed radiation field.…”

“…This has led to the development of primary dosimeters based on ionization chambers [7]. On the other hand, active dosimeters based on hybrid pixel detectors, such as the Dosepix [8], show promising results to be used for personal dosimetry in continuous, pulsed, and mixed radiation fields [9][10][11].…”

“…Recently, a Timepix3 detector was used as a way of monitoring and characterizing the mixed radiation fields generated by nuclear waste [18]. A similar characterization was performed in [11] using a Timepix3 with a CdTe sensor, and a Dosepix for dose measurements. Most of the mentioned approaches have in common the use of predecessors of the Timepix3 (i.e.…”