锰浴法绝对测量中子源发射率

锰浴法是目前绝对测量中子源发射率（中子源强度）最广泛、精度最高的方法之一。将已知活度的⁵⁶Mn溶液倒入锰池中，通过两路NaI(Tl)探测器测量锰液中⁵⁶Mn的γ计数，确定系统效率，然后通过锰液饱和活化计数得到中子源强度。利用锰浴法中子源强度标准装置绝对测量了标准²⁴¹Am-Be(α, n)中子源的强度。该中子源是国际电离辐射咨询委员会组织的国际比对CCRI(Ⅲ)-K9.AmBe的传递标准源。测量结果与比对平均值在不确定度范围内一致，验证了本标准装置的可靠性。

Absolute Measurement of Neutron Source Emission Rate With Manganese Bath Method

The manganese bath method is one of the most widespread and exact method to measure neutron source emission rate (neutron source intensity) absolutely at present. Pouring some ⁵⁶Mn solution with known activity into the bath, the system efficiency can be obtained from γ counts of ⁵⁶Mn, which is measured by two NaI(Tl) detectors. From saturated counts of a ²⁴¹Am-Be(α, n) neutron source in the bath, the source emission rate can be obtained. An standard ²⁴¹Am-Be(α, n) source which is the transfer source of the CCRI(Ⅲ)-K9.AmBe international key comparison organized by the Comité Consultatif des Rayonnements Ionisants, was measured absolutely with the neutron source emission rate standard equipment (manganese bath method). The result is coincident with the average value of the comparison within the uncertainties, therefore the reliability of the standard equipment is verified.