Standardisation and decay data of 186Re

A solution of 186Re was standardised using the 4π(PC)-γ-coincidence technique. Two gamma channels were employed to provide separate detection efficiency data arising from the two decay modes (beta and electron capture): the resulting data were analysed using a two-dimensional extrapolation. Calibration factors for a high pressure re-entrant ionisation chamber as well as for the NPL secondary standard radionuclide calibrator were also determined. An efficiency-calibrated germanium spectrometer was used to measure the emission probabilities of the X- and gamma-rays.