Li, X. (Corresponding author)MLZ* ; Azzouni, T. ; Jeschke, J. ; Müller-Buschbaum, P.MLZ* ; Röhrmoser, A. ; Spanier, L. V. ; Hutanu, V.MLZ*

2024
IEEE

Abstract: A high-dose gamma-irradiation facility has been developed for irradiation experiments in the spent fuel elements (SFE) at the research reactor FRM II. The irradiation is performed underwater. The process is certified to ISO-9001:2015. The typical gamma dose rate ranges from 0.05 kGy/h up to 100 kGy/h, depending on the cooling time of the fuel elements. The decay of the gamma dose rate and its axial profile in a total length of 70 cm in the active fuel zone are investigated using PMMA dosimeters. The energy spectrum and its temporal change in SFE are analyzed. Very low neutron flux (<3000 cm-2s-1) in SFEs is determined via activation of gold. Organic solar cells containing the donor:acceptor bulk-heterojunction PBDB-T-2F:BTP-eC9 are irradiated with different doses at 5 kGy, 10 kGy, and 15 kGy to investigate the degradation mechanisms according to the ESCC specification. The results show significant and complex changes in the material's structure, absorbance properties, and solar cell performance

Keyword(s): Instrument and Method Development (1st) ; Others (2nd)

1. IRRAD (IRRAD)

1. Irradiation facility