Absolute calibration of low energy, thick target bremsstrahlung

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Abstract

The applicability of the Monte Carlo program GEANT3 for the calculation of low energy, thick target bremssstrahlung is investigated. The results of GEANT3, version 15, show very good correspondence to those of the well established EGS4 code. In contrast it is shown that GEANT3, version 11, leads to erroneous angular distributions, total intensities and even spectral shapes for angles far from the critical angle. The use of the 115In(γ, γ′)115Inm reaction for an absolute calibration of bremsstrahlung spectra is also demonstrated. This method relies on the reconstruction of the isomer yield excitation function from a set of 115In levels with well characterized properties. It can be utilized for continuous photon spectra up to about 3 MeV.

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      Therefore, model independent information can be extracted from both kinds of experiments. Unfortunately, the reputation of the photoactivation technique was somewhat damaged in the past due to contradictory conclusions drawn from experiments with radioactive γ-ray sources [17,18]. In the meanwhile, the possibility of so-called nonresonant contributions to the photoactivation of 115mIn has been ruled out [19] (for a clarifying discussion see also Ref. [20]).

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    Work supported by the Bundesministerium für Forschung und Technologie (BMFT) under contract number 06DA641I and by the Department of Defense through the Naval Research Laboratory.

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