The environmental dose measurements of high dose Iodine131
- Slides: 34
The environmental dose measurements of high dose Iodine-131 treated thyroid cancer patients during hospitalization period Nina TUNÇEL Department of Physics, Science Faculty, Akdeniz University, Antalya, Turkey E-mail : ninatuncel@akdeniz. edu. tr
Introduction Radioiodine mostly 131 I is one of the oldest clinical radionuclide types which used widely spread in diagnosis and currently used in the treatment of both thyreotoxicosis and thyroid cancer. Large doses of 131 I are administered to ablate residual thyroid tissue and functional metastases from thyroid cancer. Nina TUNÇEL
Introduction The regulations In our country it is obligatory to hospitalize the patients receiving high doses of radioactive iodine, the same as European countries regulations. The limit for hospitalization that Turkey Atomic Energy Organization has defined is 800 Mega. Becquerel (MBq). Hospitalization is required for patients receiving doses above this amount. However, the patients whose house conditions are not suitable and who will receive doses <800 MBq can be hospitalized(1). The Radioiodine (RI) (iodine-131, or 131 I) activity is supposed to remain , <600 MBq in patients’ bodies or the external measurements received at the abdominal level from 1 -m distance is required to be under 30 micro. Sievert per hour (m. Sv/h) during their discharge(9). Additionally, in ‘protection from radiation guide, 97 Europe’ it was stated that this limit for the residual activity remaining in patient’s body needed to be 600 MBq or the external measurement value received from 1 -m distance was required to be <30 m. Sv/h (2, 3). Nina TUNÇEL
Therapy Patient with I-131 The patient should be kept at least 2 h, and if possible one day in the hospital. In the case of cancer treatment, the patient should generally be hospitalized for several days. In all cases, the dose rate at 1 m from the patient should be down to an acceptable level established by the RPC. Hospitalize: • >1100 MBq I-131 Release with restrictions: • Treatment of thyrotoxicosis • Pain palliation (Sr-89, Sm-153) • Lactating women (specified procedures) Release without restrictions: • Diagnostic procedures IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8 and 12
Room for Iodine Therapy (controlled area) • only one patient in the room • easily cleanable surfaces and utensils • extra lead shields • door closed • warning sign outside • restrictions for visitors • decontamination equipment IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Exposures From Patient Contamination External saliva perspiration breath urine 0. 5 0. 1 0. 06 0. 03 m. Sv/h 1000 MBq I-131 0 0. 5 1 2 m IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Contamination Administered activity: 1000 MBq I-131 Excretion Concentration Saliva <2 MBq/g Perspiration <20 Bq/cm 2 Breathing 100 Bq/l Urine < 500 k. Bq/ml Contamination utensils 2 k. Bq surfaces 10 Bq/cm 2 air 1 Bq/l toilet 2 k. Bq/cm 2 Generally larger than the derived limits for contamination given by ICRP (publ 57) IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Restrictions Patient with Iodine-131 IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Restrictions Patient with Iodine-131 IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Estimated % of Administered I-131 Dosimetry NCCHPS
I-131 Dosimetry NCCHPS
Isolation Ward Bed shield is positioned Areas are covered with plastic backed absorbent material. King Faisal Specialist Hospital and Research Center, Riyadh IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Discharge of Patient Abdalla Al-Haj IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Monitoring Furniture and telephone sets are surveyed. Areas suspected to be contaminated are surveyed. King Faisal Specialist Hospital and Research Center, Riyadh IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Monitoring Derived limit: 3 Bq/cm 2 METHODS • wipe testing • direct surveying The measurements should be documented IAEA Training Material on Radiation Protection in Nuclear Medicine Part 8
Structural Shielding The absorbed dose is determined by factors such as: • source strength; • length of exposure; • distance from the source; • transmission through the protective barrier. Patient with I-131 D m. Sv/h General public 0. 3 m. Sv/procedure Distance d IAEA Training Material on Radiation Protection in Nuclear Medicine Part 12
Materials and Methods In the fixed activity protocol, a high activity typically 3. 7, 5. 5 and 7. 4 GBq (100, 150 and 200 m. Ci) I– 131 was administered to 12 patients. Therapeutic doses of 131 I was administered orally in capsule form. Nina TUNÇEL
Materials and Methods • In general, the patients remained in isolation for a period of 2– 3 days. • Patients were confined to the two isolation rooms having walls covered with lead. • Each room is designed for two beds which were separated by a lead separator. • The special delay tank at hospital ground is designed for radioactive waste disposal. Nina TUNÇEL
Treatment rooms Corridor Entrance door
• Each treatment room has its own bath and toilet in room. Nina TUNÇEL
Materials and Methods The beta is often dominant radiation for I-131 treatments, although the associated gamma emission gives rise to exposures to other tissues and even to other individuals. Nina TUNÇEL
Materials and Methods • The dose rates were measured at 1 m from the patient's thyroid and abdominal levels at different interval times. • The clean and unclean room dose rate measurements were performed at each isolated room. Nina TUNÇEL
Materials and Methods For environment dose measurements the dose rate meter (Inspector Radiation Alert, S. E. International, Inc. , USA) was used. Nina TUNÇEL
Discharge of Patient Therapy with <800 MBq I-131 External monitoring 30 m. Sv/h 0 0. 1 0. 5 1 m
Results m. R/h at 1 m Discharge of Patient Day
Results m. R/h at 1 m Discharge of Patient Day
Results m. R/h at 1 m Discharge of Patient Day
Results Location Dose rate + SD (m. Rh-1) The clean room overall The toilet bowl The pillow The unclean room overall The toilet bowl The pillow 0. 43+0. 56 1. 13+1. 51 0. 03 to 2. 12 1. 49+1. 99 4. 22+2. 20 1. 33 to 13 The pillow at unclean room 5. 02+4. 35 The background level was 0. 014 m. Rh-1 in the isolation area. Nina TUNÇEL
Results Dose rate + SD (m. Rh-1) Location Surrounding rooms No Pts. 7. 06+10. 33 Service door-corridor 87. 75+91. 87 Nina TUNÇEL 1. 17+8. 84 32. 92+12. 98
Date of survey?
Scanning at 7– 10 d after therapy
I would like to thank the nuclear medicine department in Akdeniz University School of Medicine.
- "condition monitoring"
- High dose
- Hình ảnh bộ gõ cơ thể búng tay
- Ng-html
- Bổ thể
- Tỉ lệ cơ thể trẻ em
- Gấu đi như thế nào
- Chụp phim tư thế worms-breton
- Chúa sống lại
- Các môn thể thao bắt đầu bằng tiếng bóng
- Thế nào là hệ số cao nhất
- Các châu lục và đại dương trên thế giới
- Cong thức tính động năng
- Trời xanh đây là của chúng ta thể thơ
- Cách giải mật thư tọa độ
- Phép trừ bù
- Phản ứng thế ankan
- Các châu lục và đại dương trên thế giới
- Thơ thất ngôn tứ tuyệt đường luật
- Quá trình desamine hóa có thể tạo ra
- Một số thể thơ truyền thống
- Cái miệng nó xinh thế chỉ nói điều hay thôi
- Vẽ hình chiếu vuông góc của vật thể sau
- Thế nào là sự mỏi cơ
- đặc điểm cơ thể của người tối cổ
- Thế nào là giọng cùng tên
- Vẽ hình chiếu đứng bằng cạnh của vật thể
- Vẽ hình chiếu vuông góc của vật thể sau
- Thẻ vin
- đại từ thay thế
- điện thế nghỉ
- Tư thế ngồi viết
- Diễn thế sinh thái là
- Dạng đột biến một nhiễm là
- Số nguyên là gì