Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Application of the Fricke Chemical Dose Meter and its Modifications for Dosimetry of Gamma-Neutron Radiation of a Pulse Reactor

6/15/2021 2021 - #02 Global safety, reliability and diagnostics of nuclear power installations

Potetnya V.I. Koryakina E.V. Troshina M.V. Koryakin S.N.

DOI: https://doi.org/10.26583/npe.2021.2.10

UDC: 615.849.12

The authors of the paper have studied the characteristics of the Fricke chemical dosimeter (of the standard composition (D1), without adding NaCl to the solution (D2), without NaCl and with a 10-fold increased concentration of Fe2+ (D3)) under irradiation with a dose rate up to 7⋅108 Gy/min at the BARS-6 burst-type reactor with two unshielded active zones operating either in a single pulse (65 – 70 μ s) mode or in a stationary (≈ 1 h) mode.

The dosimeter radiosensitivity (i.e., optical density per Gray) depended linearly on the dose of γ-neutron radiation in the range of 25 – 750 Gy, and was 1.96 ± 0.05 μGy–1 (D1), 2.04 ± 0.05 μGy–1 (D2), 2.08 ± 0.5 μ Gy–1 (D3) in the continuous irradiation mode and 1.24 ± 0.05μGy–1, 2.00 ± 0.05 μGy–1, 1.94 ± 0.05 μGy–1 in the pulse mode, respectively. It was ≈ 60% of their sensitivity to γ-radiation of 60Со (3.40 ± 0.02 μGy–1), but for a standard Fricke dosimeter irradiated in the pulsed mode, it was 1.6 times less, i.e., 36%. The experimental value of Gn(Fe3+) for all the solutions and both modes of irradiation varied insignificantly and averaged 0.84 ± 0.11 μM/J except for the standard solution in the pulsed mode (0.66 ± 0.07 μ M/J). The neutron doses determined by chemical and activation dosimeters agreed within the error limits, but the former were systematically higher by ≈ 20%.

Thus, in the range of neutron dose rates of the fission spectrum of 0.4 – 7⋅108 Gy/min, the effect of the dose rate is absent both in the standard version of the Fricke dosimeter (without NaCl) and in the modified version (with an increased concentration of Fe2+ ions). It makes possible to use the modified Fricke dosimeter for assessing the physical and dosimetric characteristics of mixed γ-neutron radiation beams with very high intensities.

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Fricke ferrous sulphate dosimeter fast neutrons gamma radiation ultra-high dose rate BARS-6 pulse reactor