Gilligan C R D, Stokes T C, Goodwin M A, John D, Wroe-Brown J, Higginson M, McLarty J L
AWE Plc, Aldermaston, Reading, Berkshire, RG7 4PR, UK.
AWE Plc, Aldermaston, Reading, Berkshire, RG7 4PR, UK.
Appl Radiat Isot. 2024 Mar;205:111172. doi: 10.1016/j.apradiso.2023.111172. Epub 2024 Jan 5.
A radiochemically pure solution of Y was produced by the thermal neutron fission of U followed by successive chemical separations to remove fission product impurities. The gamma emission rate of the Y 1205 keV gamma was measured using multiple high purity germanium gamma spectrometers previously calibrated for counting efficiency using a certificated mixed nuclide gamma standard. The activity concentration of the Y was subsequently standardised by liquid scintillation counting. From the combination the activity concentration and gamma emission intensity, the absolute intensity of the 1205 keV gamma emission was derived as 0.2297(39)%. This data agrees within the quoted uncertainties with the absolute intensity of 0.26(4)% published in nuclear data sheets A=91 (Baglin, 2013), but reduces the uncertainty by an order of magnitude.
通过铀的热中子裂变产生了放射性化学纯的钇溶液，随后经过连续的化学分离以去除裂变产物杂质。使用多个先前已使用经认证的混合核素伽马标准进行计数效率校准的高纯锗伽马能谱仪测量了钇的1205 keV伽马射线发射率。随后通过液体闪烁计数对钇的活度浓度进行了标准化。结合活度浓度和伽马发射强度，得出1205 keV伽马发射的绝对强度为0.2297(39)%。该数据在 quoted 不确定性范围内与核数据表A = 91（Baglin，2013年）中公布的0.26(4)%的绝对强度一致，但将不确定性降低了一个数量级。 （注：原文中“quoted”未明确准确意思，暂按原样保留）
