BS ISO 8769:2020 pdf free.Measurement of radioactivity一Alpha-, beta-and photon emitting radionuclides一Reference measurement standard specifications for the calibration of surface contamination monitors. BS ISO 8769 This document specifies the characteristics of reference measurement standards of radioactive surface contamination, traceable to national measurement standards, for the calibration of surface contamination monitors. This document relates to alpha-emitters, beta-emitters, and photon emitters of maximum...