Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Reference dosimetry for inter-laboratory comparison on retrospective dosimetry techniques in realistic field irradiation experiment using 192Ir

  • Received : 2021.09.01
  • Accepted : 2022.01.03
  • Published : 2022.07.25
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Abstract

The Korea Retrospective Dosimetry network (KREDOS) performed an inter-laboratory comparison to confirm the harmonization and reliability of the results of retrospective dosimetry using mobile phone. The mobile phones were exposed to 192Ir while attached to the human phantoms in the field experiment, and the exposure doses read by each laboratory were compared. This paper describes the reference dosimetry performed to present the reference values for inter-comparison and to obtain additional information about the dose distribution. Reference dosimetry included both measurement using LiF:Mg,Cu,Si and calculation via MCNP simulation to allow a comparison of doses obtained with the two different methodologies. When irradiating the phones, LiF elements were attached to the phones and phantoms and irradiated at the same time. The comparison results for the front of the phantoms were in good agreement, with an average relative difference of about 10%, while an average of about 16% relative difference occurred for the back and side of the phantom. The differences were attributed to the different characteristics of the physical and simulated phantoms, such as anatomical structure and constituent materials. Nevertheless, there was about 4% of under-estimation compared to measurements in the overall linear fitting, indicating the calculations were well matched to the measurements.

Keywords

Acknowledgement

The study was conducted mainly under the National Long- & Intermediate-Term Project of the Nuclear Energy Development of the Ministry of Science and ICT, Republic of Korea (no. 2017M2A8A4015255) and the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KoFONs) (no. 1803014) and the research fund for Korea Retrospective Dosimetry Network (KREDOS) from Korea Institute of Nuclear Safety (no.1075001113).

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