198Au( T1/2 =2.7 d)具有衰变图简单、同位素组成单一、活化截面清楚、纯度高和易加工等一系列优点,它在中子通量绝对测量时常常作为首选.本实验室使用自行研制的新型数字式4πβ -γ符合测量装置,对在堆内活化后的一批198Au样品进行了活度的绝对测量,经比对,该批测量值与理论值在不确定度范围内一致,最大不确定度小于1.2％,该批198Au样品活度的绝对测量是可信的.%198Au has a series of merits, such as the simple disintegration Chart, the single isotope constitute, the clear activation section, the high purity and the easy machining. Therefore, 198Au is used the first choice for the neutron flux absolute measurement. The activations absolute measurement for a set of 198Au samples which have been activated in reactor is finished through a suit of new type 4πβ- γ coincidence measurement device which is designed by ourselves in lab. By compare, these measurement values and theory values accord in range of uncertainty , the most uncertainty is less than 1.2%. We can draw a conclusion that the activation absolute measurement of this set of 198Au samples is reliable.
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