5" steel shielding
HUMAN POSITIONING FOR GAMMA COUNTING
This position was found to give the highest counting rate outside the
tunnel.
Individuals were counted for four minutes.
To avoid radioactive
contamination in counting, a plastic suit was worn by the subject.
A Potassium Sstandard* and a Cesium 137 standard** were placed in turn in
the
human
position.
The standards were
imbedded
in
a masonite phantom of
variable thickness so as to closely approximate the effects of self-absorption
and radioelement distribution in the human.
*The Potassium standard was 1 kilogram of KCL.
**The Cesium standard was calibrated against a cst37 standard at the Argonne
National Laboratory with the assistance of O0.J. Steingraber and J.B. Corcoran.