Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.55: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Large area metallic magnetic calorimeters for 36Cl absolute activity measurement — •M. Linck1, A. Burck1, E. Leblanc2, M. Loidl2, H. Rotzinger1, T. Scarbrough1, A. Fleischmann1, and C. Enss1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Germany — 2Laboratoire National Henri Becquerel, CEA Saclay, France
The measurement of the activity and the energy spetrum of α and β emitting radioactive sources is of great importance in a large number of field ranging from medicine to the characterization of nuclear waste. At the same time the limitations of conventional detector techniques make this effort a highly non-trivial problem in radion metrology. Usually a number of techniques has to be combined including liquid scintilation detectors which are known for their poor energy resolution and energy dependent quantum efficiency. We have developed a detector based on a metallic magnetic calorimenter (MMC), with a metallic absorber that covers the full solid angle of 4-π around the source. Because of the calorimetric principle it has equal sensitivity for α, β and γ radiation and a quantum efficiency of nearly 100%. The MMC is based on a planar Au:Er Sensor and a meander-shaped pickup coil. We will show the data of a first experiment measuring the decay of 36Cl and compare the result to the theoretically expected spectrum for this second order forbidden β−-decay. We discuss the observed contributions to the noise, the quantum efficiency and the achieved energy resolution.