Pibida L, Bergeron D E, Collins S M, Ivanov P, Cessna J T, Fitzgerald R P, Mewburn-Crook J, Zimmerman B E, King L
National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK; School of Mathematics and Physics, University of Surrey, Guildford, GU2 7XH, UK.
Appl Radiat Isot. 2024 Mar;205:111171. doi: 10.1016/j.apradiso.2023.111171. Epub 2024 Jan 3.
Absolute gamma-ray emission intensities for 36 characteristic gamma rays from the decay of Ra, Pb, and their progeny were determined by measuring sources calibrated for activity by means of primary methods based on well-defined high-purity germanium (HPGe) detectors at both NIST and NPL. Results from the two laboratories agree with recent data evaluations, except for gamma rays with low emission intensities. The decay schemes have been re-balanced based on the new results. In addition, the half-life for Pb was measured using several HPGe detectors, ionization chambers, and a well-type NaI(Tl) detector.
通过测量在国家标准与技术研究院（NIST）和国家物理实验室（NPL）使用基于明确的高纯锗（HPGe）探测器的一级方法校准放射性的源，确定了镭、铅及其子体衰变产生的36条特征伽马射线的绝对伽马射线发射强度。除了发射强度低的伽马射线外，两个实验室的结果与最近的数据评估结果一致。衰变图已根据新结果重新平衡。此外，使用多个HPGe探测器、电离室和井型碘化钠（Tl）探测器测量了铅的半衰期。
