Fitzgerald Ryan, King Lynne
Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8642, USA.
Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8642, USA.
Appl Radiat Isot. 2020 May;159:109101. doi: 10.1016/j.apradiso.2020.109101. Epub 2020 Feb 27.
Many techniques in radionuclide metrology rely on accurate measurement of the total count rate, that is integral counting, from a detector. We present the design and results from integral counting using a live-timed multi-channel analyzer (MCA) based on a list-mode digitizer and a live-timed scalar, both with imposed, extending dead times. These systems were benchmarked against an existing NIST anti-coincidence counting system. Both systems were used to determine correction factors to an MCA that uses Gedcke-Hale dead-time corrections. Tests were performed for a large-area gas-flow proportional counter and a NaI(Tl) detector for count rates up to 80 000 s. The results were used to create correction factors suitable for alpha- and beta-particle emission rate calibrations.
放射性核素计量学中的许多技术都依赖于对探测器的总计数率进行精确测量，即积分计数。我们展示了使用基于列表模式数字化仪的实时多通道分析仪（MCA）和实时定标器进行积分计数的设计与结果，这两种仪器都具有外加的、延长的死时间。这些系统与现有的美国国家标准与技术研究院（NIST）反符合计数系统进行了基准测试。两个系统都用于确定采用格德克 - 黑尔（Gedcke - Hale）死时间校正的MCA的校正因子。对大面积气流正比计数器和碘化钠（铊）[NaI(Tl)]探测器进行了测试，计数率高达80000次/秒。结果用于创建适用于α和β粒子发射率校准的校正因子。
