The Source Production & Equipment Co. (SPEC) Model M-15 Iridium Brachytherapy is intended for use as a temporary High Dose Rate (HDR) Brachytherapy source. The clinical dosimetry parameters of this source was calculated using the MCNP Monte Carlo analysis program (MCNP6; Los Alamos National Laboratory) in accordance to the updated AAPM Task Group Report No.43 (TG43U1). All TG43U1 dosimetry parameters and their respective statistical uncertainty are presented in the reports