Relevant aspects of radiation protection in oil and gas well logging.

Radiation sources have being widely used in industrial applications, but their inappropriate use presents a large potential for hazards to human health and the environment. These hazards can be minimised by development of specific radiation protection rules and adequate procedures for the handling, use and storage of radiation sources, which should be established in a national normative framework. Recently, due to discovery of new oil and gas reservoirs on the Brazilian continental shelf, especially in deep water and the pre-salt layer, there has been a large and rapid increase in the use of radiation sources for well logging. Generic radiation protection regulations have been used for licensing the use of radiation sources for well logging, but these are not comprehensive or technically suitable for this purpose. Therefore it is necessary to establish specific Brazilian safety regulations for this purpose. In this work, an assessment is presented of the relevant radiation protection aspects of nuclear well logging not covered by generic regulations, with the aim of contributing to the future development of specific safety regulations for the licensing of radioactive facilities for oil and gas well logging in Brazil. The conclusions of this work relate to four areas, which include the specific requirements to control (1) radiation sources, (2) radiation survey meters and (3) access to radiation workplaces and (4) to control and identify the workers who are occupationally exposed.