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Cavity ionization chamber responses in the JAEA and the NMIJ high-energy photon reference fields for radiation protection

Ishii, Junya*; Shimizu, Morihito*; Kato, Masahiro*; Kurosawa, Tadahiro*; Tsuji, Tomoya   ; Yoshitomi, Hiroshi   ; Tanimura, Yoshihiko   ; Watabe, Hiroshi*

The dosimeter response should be calibrated in a reference field near the user's radiation environment. Environments around nuclear reactors and radiation therapy facilities have high-energy photons with energies exceeding that of $$^{60}$$Co gamma rays, and controlling exposure to these photons is important. The Japan Atomic Energy Agency (JAEA) and National Metrology Institute of Japan (NMIJ) have high-energy reference fields with energies above several MeV for different types of accelerators. Their reference fields have different fluence-energy distributions. In this study, the energy dependencies of the two-cavity ionization chambers, which are often used by secondary laboratories, were experimentally and computationally evaluated for each high-energy field. These results agreed well with relative expanded uncertainties ($$k$$ = 2), and their capabilities for air kerma measurements in each high-energy reference field were confirmed. Therefore, the capabilities of the air-kerma measurements can be verified in the two high-energy reference fields.

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Category:Environmental Sciences

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