フィルムバッジの中性子放射化分析による低レベルX線量計測法

抄録

  We intended to estimate low level X-radiation doses which were not detected by ordinary photographic densitometry. After development, badge films retain silver molecules in proportion to the amount of X-radiation doses in low level. The amount of silver molecules was quantified based on neutron activation analysis. In this paper, possibilities were discussed about application of the neutron activation analysis to minor radiation dosimetry of X-ray beams with energies between 40 and 150 kV in medical diagnostic use. Following results were obtained : 1) the energy response of film badge was almost flat in an energy range of X-ray from 40 to 150kV, 2) the exposure vs ¹¹⁰Ag activity curve was linear, 3) the minimum detectable amount of dose was less than 2.58 × 10^-7 C/kg (lmR).