Features of polytetrafluoroethylene application in high-dose dosimetry of accelerated protons by the method of electron paramagnetic resonance

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Abstract

EPR — a high-dose dosimetry method for use in monitoring radiation technologies has been tested for a proton beam with an energy of 18 MeV using a domestic brand of polytetrafluoroethylene as a radiation detector and an original EPR spectrometer. It has been shown that the dose range of the EPR signal is limited to 1.5 MGy, after which saturation occurs. Doses exceeding this value can be measured using additional signals in the EPR spectrum. It was found that irradiation of the detectors leads to their gamma radioactivity. The energy of the gamma radiation and the half-life of the source corresponded to the isotope 18F obtained in the nuclear reaction 18O(p, n)18F, which indicated the presence of oxygen in the detector material, which determines their paramagnetic properties.

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About the authors

Е. N. Vazirova

Ural Federal University

Author for correspondence.
Email: e.n.agdantseva@urfu.ru
Russian Federation, 620002, Yekaterinburg, Mira str., 19

M. N. Sarychev

Ural Federal University

Email: m.n.sarychev@urfu.ru
Russian Federation, 620002, Yekaterinburg, Mira str., 19

M. Yu. Artyomov

Ural Federal University

Email: mikhail.artyomov@urfu.ru
Russian Federation, 620002, Yekaterinburg, Mira str., 19

I. I. Milman

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: milman@imp.uran.ru
Russian Federation, 620108, Yekaterinburg, S. Kovalevskaya str., 18

A. I. Surdo

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: surdo@imp.uran.ru
Russian Federation, 620108, Yekaterinburg, S. Kovalevskaya str., 18

R. M. Abashev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: abashevrm@imp.uran.ru
Russian Federation, 620108, Yekaterinburg, S. Kovalevskaya str., 18

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Supplementary files

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2. Fig. 1. Calculated dependence of the relative linear energy losses of 18 MeV protons in PTFE on thickness.

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3. Fig. 2. EPR spectra of PTFE-based detector samples irradiated with 18 MeV protons at doses of 0.16, 0.48, 1.45 and 4.34 MGy.

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4. Fig. 3. Dose dependence of the main EPR signal of PTFE-based detector samples irradiated with 18 MeV protons at doses of 0.16, 0.48, 1.45 and 4.34 MGy.

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5. Fig. 4. Energy spectrum of gamma radiation of detector samples irradiated with protons with an energy of 18 MeV.

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6. Fig. 5. Change in the area under the peak at 511 keV in the energy spectrum of gamma radiation with time with a half-life of 112 min, measured over a time of more than ten half-lives.

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