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92Nbg是93Nb(n,2n)反应的产物,可作为聚变中子的指示剂核,对核反应中的中子通量进行监督。92Nbg的半衰期长达3.5×107a,由于其在样品中的丰度、放射性活度一般都很低,一般采用加速器质谱(AMS)方法。由于92Nbg的标准样品不容易获得,所以只能采用绝对测量的方法,这样会存在系统误差。94Nb是93Nb(n,γ)94Nb反应的产物,半衰期为2.03×104a,由于反应截面大,中子通量强,
92Nbg is the product of 93Nb (n, 2n) reaction, which can be used as an indicator nucleus of fusion neutron to monitor neutron flux in nuclear reaction. The half-life of 92Nbg is as large as 3.5 × 107a. Due to its abundance in the sample, the radioactivity is generally low. Accelerator mass spectrometry (AMS) is commonly used. Since 92Nbg standard samples are not readily available, only absolute measurement methods can be used, which can lead to systematic errors. 94Nb is the product of 93Nb (n, γ) 94Nb reaction with a half-life of 2.03 × 104a. Due to the large reaction cross section and strong neutron flux,