UNE-EN ISO 8769:2022

This document specifies the characteristics of reference measurement standards of radioactivesurface contamination, traceable to national measurement standards, for the calibration of surfacecontamination monitors. This document relates to alpha-emitters, beta-emitters, and photon emittersof maximum photon energy not greater than 1,5 MeV.It does not describe the procedures involved in the use of these reference measurement standardsfor the calibration of surface contamination monitors. Such procedures are specified in IEC 60325[6],IEC 62363[7], and other documents.NOTE Since some of the proposed photon standards include filters, the photon standards are to be regardedas reference measurement standards of photons of a particular energy range and not as reference measurementstandards of a particular radionuclide. For example, a 241Am source with the recommended filtration does notemit from the surface the alpha particles or characteristic low-energy L X-ray photons associated with the decayof the nuclide. It is designed to be a reference measurement standard that emits photons with an average energyof approximately 60 keV.This document also specifies preferred reference radiations for the calibration of surface contaminationmonitors. These reference radiations are realized in the form of adequately characterized large areasources specified, without exception, in terms of surface emission rate and activity which are traceableto national standards.