Guideline for management of radioisotope concentrations in exhaust gas and waste water

This guideline is written for members of the association to understand the Iyakuhatu No. 188 Report (March 16, 2001) for safety use and management of radioisotopes (RI) at the actual medical working places and consists of three parts. The first part describes the new method of calculation of RI concentrations in air, exhaust gas and waste water. Secondly, the essential observance matters in accordance to the assessment by the new calculation method are described. Here, methods of management with documents are explained concerning grasping of the quantity at use, the time engaged in the works in the radiation therapeutic room, actual measurement of RI concentrations in the exhaust gas and waste water and enforcement of facility examinations. The last part describes the essential items for securing the safety and presented the actual respective document forms. In addition, appendix describes examples for calculation of RI concentration ratios in the gas and water, the manual for measurement of concentrations in the water, detection efficiency of gas and water monitors like NaI(Tl) auto-well-counter and liquid scintillation counter, and examinations of equipments for exhausting gas and wasting water. This guideline is available on http://www.jsnm.org/ and http://www.jrias.or.jp. (K.H.)