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SILVA JR, Iremar Alves. Development of a calibration methodology of surface contamination monitors considering the uniformity mapping of the large area reference sources. 2017.129 pages. Ph.D. Thesis (Graduate program in Nuclear Technology – Applications) – Energy and Nuclear Research Institute, University of Sao Paulo, Sao Paulo, 2017. One of the requirements in the calibration of surface contamination radiation monitors is the use of wide area reference sources with a uniformity value greater than 90%. However, it has been found, in some calibration laboratories, that their sources were not meeting this requirement, which would not allow these laboratories to use such sources in their calibration procedures. It was in this context that a study was developed to propose the use of these sources, provided that correction factors are used, which are proposed in this work, which were evaluated and developed using the MCNP radiation transport code as an evaluation tool, from the uniformity mapping data. A software was also developed to calculate these correction factors using the source uniformity mapping as an input data along with an automated system for calibration of surface contamination radiation monitors. The great gain in this work was to be able to use wide area reference sources, even when they are in disagreement with the uniformity requirements of ISO 8769:2016.

Desenvolvimento de uma metodologia de calibração de monitores de contaminação de superfície considerando o mapeamento da uniformidade das fontes extensas de referência