본 연구는 고용량 방사성옥소 치료환자의 선량률을 거리와 시간대별로 산출하여 방사성옥소 치료를 위한 입원기간의 최적화와 개선방안을 제한 하고자 하였다. 그 결과 100 mCi 고용량 옥소치료환자의 24시간 후에 배꼽에서 $1,035{mu}Sv/hr$, 50 cm에서 $109{mu}Sv/hr$, 100 cm에서 $33{mu}Sv/hr$로 감쇠 되었다. 150 mCi 고용량 옥소치료환자의 24시간 후에 배꼽에서 $637{mu}Sv/hr$, 50 cm에서 $100{mu}Sv/hr$, 100 cm에서 $40{mu}Sv/hr$로 감쇠 되었다. 180 mCi 고용량 옥소치료환자의 24시간 후에 배꼽에서 $1,251{mu}Sv/hr$, 50 cm에서 $140{mu}Sv/hr$, 100 cm에서 $56{mu}Sv/hr$로 감쇠 되었다. 퇴원기준을 미국 원자력 규제위원회 고시에 $70.4{mu}Sv/hr$이므로 본 연구 결과보다 빠른 퇴원이 가능하다. 치료 환자들의 계속적인 증가 추세로 볼 때 치료병실의 부족을 해소 할 수 있다.
This study attempts to propose ways to optimize and improve the period of hospitalization for the radioiodine treatment by calculating the dose rate of patients treated with high-dose radioiodine by distance and time slot. As a result, 24 hours after the patient was treated with 100 mCi high-dose iodine, the dose rate was attenuated to $1,035{mu}Sv/hr$ at the navel, to $109{mu}Sv/hr$ at 50 cm, and to $33{mu}Sv/hr$ at 100 cm. 24 hours after the patient was treated with 150 mCi high-dose iodine, the dose rate was attenuated to $637{mu}Sv/hr$ at the navel, to $100{mu}Sv/hr$ at 50 cm, and to $40{mu}Sv/hr$ at 100 cm. 24 hours after the patient was treated with 180 mCi high-dose iodine, the dose rate was attenuated to $1,251{mu}Sv/hr$ at the navel, $140{mu}Sv/hr$ at 50 cm, and to $56{mu}Sv/hr$ at 100 cm. In light of the current criterion for discharge recommended by the US Nuclear Regulatory Commission being $70.4{mu}Sv/hr$, the present study indicates earlier discharge is feasible by applying a new scheme. This suggests that the proposed scheme in this study will help to solve the problem of shortage of treatment beds with the increasing trend of patients with thyroid cancer taken into consideration.
