Developmental research of the high-precision measuring device of radioactivity distribution in the human body with the image Processor

由于天然本底辐射的存在，保持本底辐射波动较小对于精确的全身计数是很重要的。氡的波动较大，被认为是自然本底辐射的重要组成部分之一。因此，我们研究了天气条件与氡浓度的关系，室内通风对氡浓度的影响，以及氡浓度与全身计数器计数率的比较。开发了内剂量估算系统，该系统由(1)作为去年开发的数据处理程序的输出数据获得的放射性核素和体负荷信息(2)ICRP Pub推荐的生物动力学模型组成。30.。为了评估其对实际测量情况的适用性，对点源、校准体和人体进行了测量，并研究了放射性的位置和分布对能谱的影响。

Because of the existence of natural background radiation, it is important for the precise whole-body counting to keep the fluctuation of background radiation slightly. It is considered that radon is one of the most important component of natural background radiation for its large fluctuation. Therefore, we investigated the relationship of weather condition and radon concentration, the effect of room air ventilation on radon concentration, and the comparison between radon concentration and count rate of whole-body counter.The internal dose estimation system was developed, which consisted of (1) the information of radionuclides and body burden obtained as the output data of the data process program developed last year and (2) the biokinetic model recommended by ICRP Pub.. 30.For the estimation of applicability for actual measuring situation, the point source, calibration phantom and human body were measured and the effects of position and distribution of radioactivity to energy spectrum were investigated.