[Illustration: Whole Body Counters]
This smiling youngster in the chute of a large whole body counter has
just emerged from the opening (beyond her feet) of a hollow tank of
scintillation liquid, where she lay while the radioactivity in her body
was being “counted.” In a minute she will step into her slippers (on the
ramp, right) and be ready for play. The sensitive, heavily shielded
radiation-detecting equipment shown has many uses that are described in
this booklet.