Radiometric survey of teletherapy treatment rooms in Brazil

Radiation Protection Dosimetry
Eduardo de PaivaLuiz A R da Rosa

Abstract

The Brazilian national regulatory authority, National Commission of Nuclear Energy, requires that dose rates in the vicinity of teletherapy treatment rooms do not exceed the permissible limits for workers as well as members of the public, depending on the place considered. At the end of 2005, the Brazilian national regulatory authority reduced the permissible dose limit for controlled areas from 1000 to 400 microSv week(-1). Therefore, the aim of this work is to verify the adequacy of structural shielding to this new limit for telecobalt units that had their sources changed and clinic linear accelerators (ALs) installed before the end of 2005. Considering the ALs, measurements of dose rates in controlled areas did not exceed the new permissible limit, excepting for a single case. In the case of (60)Co units, a similar situation is observed for controlled areas, although several non-conformities to the limit of uncontrolled area could be observed.

References

Aug 4, 2007·Radiation Protection Dosimetry·A FacureR C Falcão
May 27, 2008·Radiation Protection Dosimetry·L A R da RosaR V Oliveira
Oct 7, 2008·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Marco A FrotaAlphonse Kelecom

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Citations

May 19, 2011·Journal of Applied Clinical Medical Physics·Eduardo de PaivaAlexandre F Velasco

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