An Active Dose Measurement Device for Ultra-short, Ultra-intense Laser Facilities. Issue 6 (6th June 2022)

• Record Type: Journal Article
• Authors: Wei, Shuoyang; Gong, Hui; Song, Honghu; Hu, Ankang; Xiong, Jun; Zhang, Hui; Li, Junli; Qiu, Rui
• Is Part Of: Health physics. Volume 122:Issue 6(2022)
• Page Start: 685
• Page End: 695
• Publication Date: 2022-06-06
• Subjects: detector, radiation -- lasers -- Monte Carlo -- radiation dose; Biophysics -- Periodicals; Health Physics -- periodicals; Radiation Protection -- periodicals; Radiotherapy -- periodicals; Medische fysica; Electronic journals; 612.01448
• DOI: 10.1097/HP.0000000000001560
• Languages: English
• ISSNs: 0017-9078

Abstract

Abstract: Ultra-short, ultra-intense laser facilities could produce ultra-intense pulsed radiation fields. Currently, only passive detectors are fit for dose measurement in this circumstance. Since the laser device could generate a dose up to tens of mSv outside the chamber in tens of picoseconds, resulting in a high instantaneous dose rate of ~10 7 Sv s −1, it is necessary to perform real-time dose measurement to ensure the safety of nearby workers. Due to fast response and excellent radiation resistance, a diamond-based dose measurement device was designed and developed, and its dose-rate response and its feasibility for such occasions were characterized. The measurement results showed that the detector had a good dose-rate linearity in the range of 3.39 mGy h −1 to 10.58 Gy h −1 for an x-ray source with energy of 39 keV to 208 keV. No saturation phenomenon was observed, and the experimental results were consistent with the results obtained from Monte Carlo simulation. The charge collection efficiency was about 80%. Experimental measurements and simulations with this dose measurement device were carried out based on the "SG-II" laser device. The experimental and simulation results preliminarily verified the feasibility of using the diamond detector to measure the dose generated by ultra-short, ultra-intense laser devices. The results provided valuable information for the follow-up real-time dose measurement work of ultra-short, ultra-intense laser devices.