Abstract
The National Institute of Ionizing Radiation Metrology of ENEA (Italian National Agency for New Technologies, Energy and Sustainable Economic Development) (ENEA-INMRI) organized 7 national Inter- Laboratory Comparisons (ILC) on the measurement of the environmental radioactivity and of radionuclides of medical interest. In this paper, the ILC N°6, on surface contamination measurements, will be described. The objectives of this ILC were to test, at the national level, the participant capability of measuring the surface emission rate of two Wide Area Sources (WAS) of 241Am (alpha emitter) and of 90Sr (beta emitter). The reference values of the two surface emission rates were determined using the ENEA-INMRI Primary Standard, a windowless gas-flow proportional counter. The participants were asked to collect 10 readings of the emission for each of the two WAS. Each participant could use the most appropriate instrument and method, whose type, characteristics, and efficiency had to be communicated to ENEA-INMRI along with the values of the readings carried out under the same measurement conditions. From these data it was possible to check the consistency of the values of the surface emission rate determined by each participant, and their deviation from the reference values.
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