美国正在试验用锎~(252)作中子源在野外进行铀样品的活化分析。中子源合锎105微克。当样品中的 U 含量不小于0.01%时,分析精度可达10%。工作原理如下:用锎~(252)中子源照射铀样品,使其中的铀~(238)转变为铀~(239),然后测铀~(239)所放出的γ射线的74.7千电子伏峰值。样品重量为25克时,每次辐照需时20分钟,然后测量10分钟。 The United States is experimenting with 锎 ~ (252) as a neutron source in the field of uranium sample activation analysis. Neutron source 锎 105 micrograms. When the sample in the U content of not less than 0.01%, the analysis accuracy of up to 10%. The working principle is as follows: The uranium sample is irradiated with 锎 ~ (252) neutron source to convert uranium 238 into uranium 239, and then the γ-ray emitted from uranium 239 239.7 eV Peak. At a sample weight of 25 grams, each irradiation took 20 minutes and then measured for 10 minutes.