KIP publications

 
year 2004
author(s) M. Loidl, E. Leblanc, T. Branger, H. Rotzinger, T. Daniyarov, M. Linck, A. Fleischmann, C. Enss
title Feasibility study of absolute activity measurement with metallic magnetic microcalorimeters
KIP-Nummer HD-KIP 04-70
KIP-Gruppe(n) F3,F4,F5
document type Paper
Keywords Absolute activity measurement; Metallic magnetic microcalorimeters
source Nucl. Inst. Meth. A, 520, 73-75 (2004)
doi 10.1016/j.nima.2003.11.224
Abstract (en)

We report on a feasibility study on precise determination of mass-specific activity of low-energy emitting radioisotopes. Conventional methods of activity measurement suffer from source self-absorption and a strong decrease in detection efficiency for low-energy electrons and photons. We propose a new method based on metallic magnetic microcalorimeters with the source embedded in the detector target in a 4π geometry. First results with a 55Fe source show that electrons and photons are detected with a detection efficiency close to unity and with little loss of energy for electrons. The aim of this study is to provide standards of activity with very low uncertainties in the framework of radiation metrology. 

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