It is demonstrated that the radioactivity of Re-188, which is of curre
nt interest for the use in therapeutic applications in the field of nu
clear medicine, can be precisely determined by Cherenkov counting usin
g conventional scintillation counters, ranging from as low as backgrou
nd level to a 10(4) Bq level. Parameters such as sample volume, type o
f the counting vial, etc., which may affect the detection; efficiency
of this method, are systematically examined and evaluated. (C) 1998 El
sevier Science Ltd. All rights reserved.