【摘要】 研制了β参考辐射系统,它是由740MBq的¹⁴⁷Pmβ源、74MBq和740MBq的⁹⁰Sr+⁹⁰Y β源、整平过滤器、源夹、源架、源测距杆、快门、控制器和β剂量仪校准架组成。带有整平过滤器的740MBq¹⁴⁷Pmβ源和74MBq⁹⁰Sr+⁹⁰Y β参考辐射和不带整平过滤器的740MBq⁹⁰Sr+⁹⁰Yβ参考辐射,分别在20cm、30cm和30cm距离处,剩余最大能量分别为0.14MeV、1.98MeV和2.18MeV,组织吸收剂量率D（0.07）分别为1.547mGy/h（1996年5月20日）、5.037mGy/h（1996年5月10日）和93.57mGy/h（1996年5月15日）,总不确定度分别为3.0％、1.7％和1.7％。第一种和第2种β参考辐射,在垂直于β射线束轴平面内,直径为18cm的面积范围内,剂量率的变化分别在±6％和±3％以内。更多还原

【Abstract】 A system of beta reference radiation has been developed, that is composed of 740 MBq 147Pm beta source, 74 MBq and 740 MBq 90Sr+90Y p sources, compensation filters, a source handling tool, a source jig, spacing bars, a sutter, a control unit and a beta dose meter calibration stand. For 740 MBq 147Pm and 74 MBq 90Sr + 90Y beta reference radiations with compensation filters and 740 MBq 90Sr + 90Y beta reference radiation without compensation filter, at 20 cm, 30 cm and 30 cm distance separately; the residual energy of maximum is 0. 14 MeV, 1. 98 MeV and 2.18 MeV separately; the absorbed dose to tissue D (0.07) is 1.547 mGy/h (1996-05-20) , 5. 037 mGy/h (1996-05-10) and 93. 57 mGy/h (1996-05-15) separately; the total uncertainty is 3. 0%, 1.7% and 1.7% separately. For the first and the second beta reference radiation, the doserate variability in the area of 18 cm diameter in the plane perpendicular to the beta-ray beam axis is within + 6 % and +3% separately.更多还原