| The glove box on the top of the shield containing the source holders/sources for the routine calibrations of
the detectors in the
same running condition. The glove box is continuously maintained
in HP Nitrogen atmosphere. Cu bars with o-rings fullfil the Cu tubes connecting it to the inner Cu box; they
are removed when the sources holders (with o-rings) have to be introduced. It is equipped also with a
lateral compensation chamber. Same system as for DAMA/NaI.