Abstract

For the purpose of assessing the radiation dose of the victims involved in the nuclear emergency or radiation accident, a new type of X-band EPR resonant cavity for in vivo fingernail EPR dosimetry was designed and a homemade EPR spectrometer for in vivo fingernail detection was constructed. The microwave resonant mode of the cavity was rectangular TE101, and there was a narrow aperture for fingernail detection opened on the cavity’s wall at the position of high detection sensitivity. The DPPH dot sample and the fingernail samples were measured based on the in vivo fingernail EPR spectrometer. The measurements of the DPPH dot sample verified the preliminary functional applicable of the EPR spectrometer and illustrated the microwave power and modulation response features. The fingernails after irradiation by gamma-ray were measured and the radiation-induced signal was acquired. The results indicated that the cavity and the in vivo EPR dosimeter instrument was able to detect the radiation-induced signal in irradiated fingernail, and preliminarily verified the basic function of the instrument and its potential for emergency dose estimate after a radiation accident.

Highlights

  • For the purpose of assessing the radiation dose of the victims involved in the nuclear emergency or radiation accident, a new type of X-band EPR resonant cavity for in vivo fingernail EPR dosimetry was designed and a homemade EPR spectrometer for in vivo fingernail detection was constructed

  • According to the principal rules of EPR spectroscopy, the magnetic field, modulation, and microwave electromagnetic field should be applied to the sample in a certain direction, amplitude, frequency, and other parameters at the same time

  • The main components of the spectrometer included a combined magnet unit with an electromagnet and permanent magnet, magnet modulation coils and its amplifier, microwave resonant cavity, microwave bridge, Lock-in amplifier, host computer installed with control and data process software, and DA-AD interface

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Summary

Introduction

For the purpose of assessing the radiation dose of the victims involved in the nuclear emergency or radiation accident, a new type of X-band EPR resonant cavity for in vivo fingernail EPR dosimetry was designed and a homemade EPR spectrometer for in vivo fingernail detection was constructed. The results indicated that the cavity and the in vivo EPR dosimeter instrument was able to detect the radiation-induced signal in irradiated fingernail, and preliminarily verified the basic function of the instrument and its potential for emergency dose estimate after a radiation accident. There are several technical issues in the realization of in vivo EPR fingernail spectroscopy, and one of the most vital challenges is that the microwave resonator of the EPR spectrometer is not suitable for in vivo fingernail measurement. It is Scientific Reports | (2021) 11:2883

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