The Optimization of the Tank Decay System for the Radioiodine Therapy Facility.

Document Type : Original Paper


cairo ,egypt



Introduction: Radioiodine (I-131) is widely used for thyroid cancer treatment. High radioiodine doses are administered to patients isolated in lead-lined rooms for three to five days. Radioiodine patients’ excreta contain a high radioactivity concentration of Iodine (I-131). A tank decay system is used for the safe disposal of radioactive waste. The Tank system design is optimized because of the limitations of space and cost.

Method: In our department, six iodine patients are admitted per week, and 7400 MBq is the maximum administrated activity for each patient. The accumulated activity, Tank capacity and number of tanks are calculated for different collection periods (10,20,30,40,50,60,70.80,90,110,120,130 days).

Results: The accumulated activity in the decay tank is 77.2 GBq over 70 days (optimal collection period), while the released activity is 0.29652 GBq after 64.7 days (decay period). The number of tanks needed to reach the discharge concentration activity (35.3 KBq/L) is 2 tanks with a capacity of 8400 L for each one.

Conclusion: The collection period of 70 days is an optimum solution to reduce the cost and tank capacity to two tanks with a capacity of 8400 L for each.


Main Subjects

Articles in Press, Accepted Manuscript
Available Online from 06 April 2024
  • Receive Date: 19 October 2023
  • Revise Date: 18 March 2024
  • Accept Date: 06 April 2024