NBN ISO 8769:2021

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 photon energy not greater than 1,5 MeV.
It does not describe the procedures involved in the use of these reference measurement standards
for 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 regarded
as reference measurement standards of photons of a particular energy range and not as reference measurement
standards of a particular radionuclide. For example, a 241
Am source with the recommended filtration does not
emit from the surface the alpha particles or characteristic low-energy L X-ray photons associated with the decay
of the nuclide. It is designed to be a reference measurement standard that emits photons with an average energy
of approximately 60 keV.
This document also specifies preferred reference radiations for the calibration of surface contamination
monitors. These reference radiations are realized in the form of adequately characterized large area
sources specified, without exception, in terms of surface emission rate and activity which are traceable
to national standards.