Dresden 2011 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 7: Radiation Physics Measurements

ST 7.1: Talk

Thursday, March 17, 2011, 16:00–16:15, POT 112

(contribution withdrawn) Performance of new Solid State γ-detectors in ⁵⁷Fe Mössbauer spectroscopy experiments — •Til Dellmann and Hans-Henning Klauß — Institute of Solid State Physics, TU Dresden

Usually, proportional counter tubes are used in ⁵⁷Fe Mössbauer spectroscopy for the detection of the 14.4 keV transition line. The recent developement of Si-based solid state detectors led to commercially available drift detectors (SDD) and high purity PiN diodes without the necessity of cooling with liquid nitrogen. First applications of SDD detectors in the analysis of minerals [1] are already highly promising.

In this talk, we will present a detailed comparison between the three detector types and their use in moessbauer spectroscopy using a standard absorber-source-combination (metallic iron with a 2.0 GBq ⁵⁷Co/Rh source) in absorbtion geometry. Starting with the definition of a global efficiency function, which optimises the goodness of a moessbauer spectrum and thus the required measurement time, we examined the influence of the intrinsic detector parameters on the global efficiency.

[1] Tudor Ruskov et al., Phys Chem Minerals 35 (2008)