“…In the past, the papers of note have related mainly to biokinetics and, more specifically, have featured biokinetic models being developed for use by the ICRP. However, this year we were struck by a thorough evaluation of the detection of 241 Am in an anatomical phantom (Nogueira and Rühm 2020). This was based on gamma detection from contaminated skulls and is relevant to the calibration of detectors used to determine the 241 Am burdens of humans using in vivo counting.…”