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| Study on the environmental impact of the I-131 treatment in clinical nuclear medicine |
| YAN Yuan, JIN Xiao |
| The China Institute of Atomic Energy, Beijing 102413 China |
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Abstract Objective To master the release source and key release pathways of the I-131 treatment site, and to give the annual normalized discharge by cases and public collective dose within 80 km.Methods According to monitored data of in-site samples, the annual normalized discharge by cases of the chimney discharge is derived. Using the Screen3 program and AirDos program, the public doses are calculated.Results The annual average case normalized discharge amount from chimney is 6.6E+06 Bq/a. The annual release of radioactive gases from unorganized release is 1.4E+07Bq/a. For the maximum individual dose of the four major regions:the northern coast, the southern coast, the northern inland and the southern inland, dose of the child is the greatest among the different age groups. Individual dose in case of the 20m release height is six times higher than that in case of 50m release height,and it is twice in collective dose.Conclusion It is recommended that the regulatory authorities should pay attention to the changes of airborne I-131 concentration in the environmental sensitive points and the effectiveness of the radioactive airborne effluent filtration system. When a hospital conducts a site selection and design of a radionuclide treatment facility, it should be located in the downwind direction of the dominant wind direction and stayed away from children and maternity wards.
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Received: 23 May 2018
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