Pibida L, Zimmerman B E, King L, Fitzgerald R, Bergeron D E, Napoli E, Cessna J T
National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
National Institute of Standards and Technology, 100 Bureau Dr, MS 8462, Gaithersburg, MD, 20899-8462, USA.
Appl Radiat Isot. 2020 Feb;156:108943. doi: 10.1016/j.apradiso.2019.108943. Epub 2019 Oct 15.
The National Institute of Standards and Technology (NIST) measured the internal pair production branching ratio of Y using two sources and four high purity germanium (HPGe) detectors to detect the resulting annihilation radiation. The internal pair production branching ratio determined from these measurements, (32.0 ± 1.5) × 10 (k = 1), agrees within 1 standard uncertainty with the recommended value of (32.6 ± 0.7) × 10 (k = 1) from the DDEP database.
美国国家标准与技术研究院（NIST）使用两个源和四个高纯锗（HPGe）探测器来检测产生的湮没辐射，从而测量了Y的内对产生分支比。根据这些测量确定的内对产生分支比为(32.0 ± 1.5) × 10⁻⁴（k = 1），与DDEP数据库推荐值(32.6 ± 0.7) × 10⁻⁴（k = 1）在1个标准不确定度范围内相符。
