A Plastic Phosphor Well Counter for Sample Volumes up to 400 ml.

Abstract

A scintillation counter using a plastic phosphor well is described in which the count rate is satisfactorily independent of a sample volume for 10-410 ml. Its efficiency and sensitivity are some 25 and 2 to 4 times greater, respectively, than for a counter using 32 small G.M. tubes. The use of the counter with Fe59, I1, and Cr51, is discussed with particular reference to both urine and fecal samples and whole -body counting of small animals. It is not suitable at present for double isotope counting.