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.