Advanced Physics for Brachytherapy 2018
Brachytherapy Source Strength
Only the reference air kerma rate (RAKR) K R to a standards laboratory (i.e., NMI or PSDL)
is a quantity that is traceable
RAKR defined as kerma rate to air @ 1 meter in vacuo , corrected for attenuation/scatter
RAKR defined on the source transverse-plane for photons with E > δ δ threshold is dependent on source calibration protocol
RAKR has units Gy/s, also Gy/h or μGy/s (unit conversion - convenience)
mg Ra, mgRaEq, mCi (apparent activity), Bq are not traceable quantities
Obsolete units: mg Ra, mgRaEq, mCi (apparent activity), Bq
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