BOLOMETER CHARACTERIZATION WITH A SPECIALLY DEVELOPED CRYOGENIC SOURCE HAVING MORE THAN 5 PEAKS IN THE 1-6 KEV RANGE

At very low temperature (10-50 mK), and at relatively low energy (typi cally 100 eV-10 keV), the linearity and resolution of bolometers need to be carefully tested. Commercially available sources below 6 keV are rare and difficult to cool down. We have developed a specially design ed compact X-ray source where Fe-55 is combined with an ion-exchanged membrane containing more than three fluorescent elements. More than fi ve peaks can be identified form 1 keV to 6.5 keV. A spectrum obtained with a 0.5 mg composite diamond bolometer, allowing a good measurement of linearity and resolution as a function of energy is presented. It is compared with a spectrum of the same source measured with a classic al germanium detector. Since bolometer detectors have neither window, nor dead layer effects, bolometer spectra obtained with these sources could be used to directly calibrate the efficiency response of classic al detectors at very low energy.