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Radiation Detection and Measurement
Published in Shaheen A. Dewji, Nolan E. Hertel, Advanced Radiation Protection Dosimetry, 2019
The term “dosimeter” normally refers to a personal dosimeter that is worn on the body and is used to determine the personal dose equivalent received by the individual wearing the device. Personal dosimeters are generally not electrically powered, although there are some electronic personal dosimeter types, and they will store a reading by means of a radiation-induced change in a detector element. The term “instrument” refers to an electrically powered device that can measure exposure, or dose equivalent, as a function of time. Instruments may be portable battery-powered devices, or installed devices that are alternating current (AC) line powered. Radiation protection instruments that make use of pulse counting techniques are generally used as detectors of radioactivity rather than dose equivalent.
Dose rate distribution measuring method using personal dosimeters and localization devices
Published in Journal of Nuclear Science and Technology, 2022
Daisuke Shinma, Yukihiro Murata, Yuichiro Ueno, Akihito Yamaguchi, Masahiro Tomizawa, Toshiya Yamano, Junichi Kitamura
Figure 4 is a photo of the electronic personal dosimeter that was utilized in this research. The representative characteristics are shown in Figures 5–7. They were measured in accordance with JIS standard (JIS Z 4312:2002) [9]. Examples of measurement data are shown in Figure 8. These data were acquired in an environment where a 137Cs (280 MBq) radiation source existed. The dosimeter was placed close to the radiation source or away from it. The results showed that the device output measurement data every 1 s. Also, between 10 and 20 s, the accumulated dose amount increased steeply when the device was in a relatively high dose rate position such as about 8 counts/s. If the conversion coefficient cj, that is mentioned later, was applied, 8 counts/s equals to 262 μSv/h.
Radiation Protection at Petawatt Laser-Driven Accelerator Facilities: The ELI Beamlines Case
Published in Nuclear Science and Engineering, 2023
Anna Cimmino, Veronika Olšovcová, Roberto Versaci, Dávid Horváth, Benoit Lefebvre, Andrea Tsinganis, Vojtěch Stránský, Roman Truneček, Zuzana Trunečková
A two-dosimeter rule is implemented at ELI Beamlines. Employees and users are requested to wear an electronic personal dosimeter (EPD) and a passive dosimeter. The EPDs (Ref. 69), which are sensitive to gamma and beta particles and provide a real-time measurement of personal deep [Hp(10)) and surface (Hp(0.07)] dose equivalent, were chosen for this purpose. Additionally, EPDs from the same manufacturer, but sensitive to gammas and neutrons, are also available. All EPDs have an active warning system (audible alarm) and internal memory for data retrieval. Readout and data analysis of the EPDs are performed inhouse, while regular calibrations are performed at the Czech Metrology Institute70 (CMI).