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99Tc一种长半衰期纯β衰变核素(T1/2=2.11×105a),β衰变能量293.7keV。在核退役和放射性废物处置工作中,监测Tc对环境污染受到越来越多的关注。本工作用4πβ-γ数字符合装置绝对测量了用60Co标准效率示踪测量的99Tc比活度。工作中发现微量的99Tc盐在所制备的4π薄膜源上容易脱落,研究了稳定的制源方法。对1批99Tc标准溶液制备了示踪测量源,使用数字符合测量方法测量混合源的活度。测量得到的β、γ数据流通过数据
99Tc a long half-life of pure beta decay nuclide (T1 / 2 = 2.11 × 105a), beta decay energy of 293.7keV. In nuclear decommissioning and radioactive waste disposal, monitoring of Tc is receiving more and more attention on environmental pollution. In this work, the specific activity of 99Tc measured with the 60Co standard efficiency tracer was measured absolutely with a 4πβ-γ digital coincidence device. In the work, trace amount of 99Tc salt was found to be easily shed on the prepared 4π film source, and stable source method was studied. Tracer sources were prepared for one batch of 99Tc standard solution and the activity of the mixed source was measured using a digital conformity measurement method. Measured β, γ data flow through the data