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在核电站关闭和退役期间,一些工作人员自觉或不自觉地接受了照射,因此需要对工作场所进行β辐射监测.研究采用组合式剂量计,它有六个不同的过滤层,每层下面放置4个LiF TLD,其直径为4.5cm,质量厚度为173±4mg·cm~(-2).在TLD周围用最小10mm厚的有机玻璃包围,这个厚度足以吸收由~(90)Sr/~(90)Y源发射的高能β射线,只有通过滤片方向的β射线方能到达TLD.这种剂量计可作为测量β辐射的定向剂量当量H’的剂量计,滤片厚度为1.2～950mg·cm~(-2)不等.
During the closure and decommissioning of nuclear power stations, some staff members consciously or unconsciously accepted the exposure and therefore required a beta radiation monitoring of the workplace using a combination dosimeter with six different filter layers, each placed below 4 A LiF TLD with a diameter of 4.5 cm and a mass thickness of 173 ± 4 mg · cm -2 is surrounded by a TLD with a minimum of 10 mm thick plexiglass which is thick enough to absorb 90 Sr / ) The high-energy β-ray emitted by the Y source can reach the TLD only through the β-ray in the direction of the filter, which can be used as a dosimeter for measuring the directional dose equivalent H ’of β radiation with a thickness of 1.2-950 mg · cm ~ (-2) range.