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ST 6.3 –
Protección radiológica del público y el ambiente
DOSE ASSESSMENT TO THE REPRESENTATIVE PERSON USING
PROBABILISTIC METHODOLOGY
L. D. Ferreira, Nelson
1
*; R. R. Rochedo, Elaine
2
; P. Mazzilli, Bárbara
3
1
CTMSP. Brazil.
2
IRD. Brazil.
3
IPEN. Brazil.
* Responsible author, email: nelsonldf@uol.com.br
The International Commission on Radiological Protection - ICRP proposed in 2006 an
amendment to the establishment of the population group that should be used for environmental
impact assessment purposes, specifically to protect the public from facilities that manipulate
nuclear or radioactive materials or radiation sources. For this purpose, it recommended the use
of the concept of the “representative person”. This term is equivalent and replaces the “average
member of the critical group” defined in previous publications of the ICRP. According to ICRP
Publication 101, the dose to members of the public can be estimated using deterministic or
probabilistic methods. The data used to perform the assessments comprise source, site specific
and habits data of the local population. In this study, it was performed a probabilistic dose
assessment, where the data were utilized, whenever possible, in the form of a distribution and
the result is a distribution that presents a range of possible doses based on their probability of
occurrence. As reference facility, it was considered the predicted releases from the Uranium
Hexafluoride Production Plant (USEXA), located at Centro Experimental Aramar (CEA), Iperó,
SP, Brazil. The model used was based on those recommended by the International Atomic
Energy Agency-IAEA and the probabilistic assessment was done with the Crystal Ball software.
The doses were calculated considering a region of 10 km surrounding the CEA site. Although
the doses obtained were very low, with the 95% percentile being well below the maximum dose
constraint to members of critical group, related to effluents release, established by the Brazilian
Regulatory Body, it could be seen that the new methodology is by far more complex than that
previously one used for the critical group and similar results for both methodologies were
obtained.