1978 年 25 巻 2 号 p. 109-112
As an aqueous chemical dosimeter for measuring ionizing radiation, the chemical 4,4’ (5-chloro-2-thenilidene) bis [N,N-dimethylaniline], a derivative of the leuco triarylmethane compounds, was used. This chemical dosimeter is an aqueous solution composed of 10-4 M lenco compounds, 10-4 M ferrous ammonium sulfate, 10-4 M sodium chloride and 7×10-3 M of hydrochloric acid. This solution is colourless but it becomes blue-green or bright blue after irradiation. The optical denisty of this solution at the main absorption peak of 635 mµ increases linearly with the increasing x-ray dose of from 50 R to 2,000 R and no dose-rate dependency is found from 13.5 R/ min to 270 R/ min of 60Co γ-ray. 896 gram rads was the measured value of the integral absorbed dose per exposure in panoramic tomography (Orthopantomograph type OP-2)
