【摘要】 <正> 研制了β参考辐射系统,它是由740MBq的¹⁴⁷Pm β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740MBq¹⁴⁷Pm β源和74MBq⁹⁰Sr+⁹⁰Y β参考辐射和不带整平过滤器的740MBq⁹⁰Sr+⁹⁰Y β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2.18 MeV,组织吸收剂量率D（0.07）分别为1.547 mGy/h(1996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 β sources, compensation filters, a source handling tool, a source jig, spacing bars, a sutler, 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 , the residual energy of maximum is 0. 14 MeV,l. 98 MeV and 2. 18 MeV,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), the total uncertainty is 3.0%, 1.7% and 1.7%. 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% respectively.更多还原