We present a prototype of metallic magnetic calorimeters that we are developing for absolute activity measurements of low energy emitting radionuclides. We give a detailed description of the realization of the prototype, containing an 55Fe source inside the detector absorber. We present the analysis of first data taken with this detector and compare the result of activity measurement with liquid scintillation counting. We also propose some ways for reducing the uncertainty on the activity determination with this new technique.
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Loidl, M., Leblanc, E., Rodrigues, M. et al. Metallic Magnetic Calorimeters for Absolute Activity Measurement. J Low Temp Phys 151, 1055–1060 (2008). https://doi.org/10.1007/s10909-008-9793-7