Activity measurements of ³H, ²⁴¹Am and ⁶⁰Co solutions were performed to compare digital coincidence modules used at PTB and POLATOM for TDCR and 4πβ(LS)-γ coincidence counting. The activities determined with various coincidence modules connected in parallel to the same counter at PTB were found to be consistent. Observed discrepancies caused by differences in the coincidence resolving time did not exceed 0.14%. Accidental coincidences simulated by a frequency generator were registered, and the coincidence resolving time was determined.

中文翻译：

---

POLATOM和PTB上用于TDCR和4πβ（LS）-γ符合计数器的数字符合模块的比较。

进行了³ H，²⁴¹ Am和⁶⁰ Co溶液的活度测量，以比较PTB和POLATOM上用于TDCR和4πβ（LS）-γ符合计数的数字符合模块。发现使用与PTB的同一计数器并行连接的各种符合模块确定的活动是一致的。巧合解决时间差异导致的观察到差异不超过0.14％。记录由频率发生器模拟的偶然巧合，并确定巧合解决时间。