Scintillation Properties of CsI:Na, $^{133}$Ba Crystal

In Hyperball-J experiments, the lutetium oxyorthosilicate (Lu
$_{2}$
SiO
$_{5}$
:Ce, LSO) scintillators are constantly used to monitor and calibrate the Ge detectors. The LSO crystal has
$^{176}$
Lu as a natural radioactive source. A new CsI:Na crystal that contains a
$^{133}$
Ba radioactive source was developed in this study. This developed crystal can be used for detector calibration instead of LSO scintillators.