LOW-LEVEL DOSIMETRY BASED ON ACTIVATION ANALYSIS OF BADGE FILM REPORT 2 : APPLICATION TO X-RAY ENERGY RANGE OF DIAGNOSIS

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  • MORIKAWA KAORU
    Radiology Department, College of Biomedical Technology, Osaka Univ.
  • MAEDA MASAYUKI
    Department of Radiology, Wakayama Medical College
  • SATO TAKASHI
    Reactor Division. Research Reactor Institute, Kyoto Univ.
  • ONO KOICHI
    Reactor Division. Research Reactor Institute, Kyoto Univ.
  • YAMASHITA KAZUYA
    Radiology Department, College of Biomedical Technology, Osaka Univ.
  • INAMOTO KAZUO
    Radiology Department, College of Biomedical Technology, Osaka Univ.

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  • バッジフィルムの放射化分析による低線量測定法 : 第2報診断用X線エネルギー領域への適用

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Abstract

We intended to estimate low level radiation doses which were not detected by ordinary photographic densitometry. Minor radiation doses recorded as silver atoms of badge films, which were not detected with a photographic densitometer, were estimated by irradiating the silver atoms with thermal neutrons by KUR (Kyoto University Research Reactor). We have already reported "Low-Level Dosimetry based on Activation Analysis of Badge Film, Report 1 : Sensitiveness for ^<60Co> γ-rays". In this paper, possibilities were discussed about the application of the previous method to X-rays with energies between 35 to 150 kV in diagnostic use. Both the calculation and experiments were performed on the energy response of badge film in the energy range. Neutronactivation was performed on the X-ray exposed badge film at a thermal neutron flux of 10^9 neutrons/cm^2/sec for 2 minutes, then emitted gamma rays of ^<110>Ag, 658 keV, were measured with a NaI (T1) detector. The exposure vs ^<110>Ag activity curve was analyzed, and the minimum detectable amount was estimated. Following results were obtained : (1) the energy response of badge film was almost flat in the X-ray energy range from 35 to 150 kV, (2) the exposure vs ^<110>Ag activity curve was linear, (3) the minimum detectable amount of dose was less than 2.58 x 10^<-7> C/kg (l mR). These data suggest that detection of minor doses is possible with the film badges for personnel exposures in the X-ray diagnosis division of the radiology department.

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