Re-sourcing an MDS Nordion Cobalt 60 gamma cell

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The DTU Department of Health Technology on DTU Risø Campus in Roskilde possesses a MDS Nor-dion Gamma cell 220 Irradiator S/N 220R. It serves as the national standard for high-dose dosimetry. The MDS Nordion Gamma cell 220 Irradiator S/N 220R is shown on the enclosed picture in Appendix C. The gamma cell was initially installed in 2007, and it was resourced in 2014 and in 2021. The existing loading of the Gamma cell consists of 30 (thirty) type C-198 sources of total activity 9,8 kCi (363 TBq) in December 2024. The number of free source positions in the source cage is 18. DTU wants to re-source or replace sources in the Gamma cell to achieve a total activity of 15 kCi (555 TBq) of Co-60. This may be achieved by the addition, or replacement, of sources in existing Gamma ell, or by the supply of an exchange Gamma cell with new sources.