Magnesium-walled argon gas flow ionization chamber (Mg(Ar)) is used for photon dose measurements in the epithermal neutron beam of FiR 1 reactor in Finland. In this study, the photon dose measurements were re-evaluated against calculations applying a new chamber calibration factor defined in water instead of in air. Also, effect of the build-up cap on the measurements was investigated. The new calibration factor provides improved agreement between measured and calculated photon dose. Use of the build-up cap does not affect the measured signal in water in neutron beam.
- ionization chamber
Koivunoro, H., Hyvönen, H., Uusi-Simola, J., Jokelainen, I., Kosunen, A., Kortesniemi, M., Seppälä, T., Auterinen, I., & Savolainen, S. (2011). Effect of the calibration in water and the build-up cap on the Mg(Ar) ionization chamber measurements. Applied Radiation and Isotopes, 69(12), 1901-1903. https://doi.org/10.1016/j.apradiso.2011.03.037