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KMID : 1151820190130040653
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 4 p.653 ~ p.659
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The Study of Radiation Exposed dose According to 131I Radiation Isotope Therapy
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Chang Bo-Seok
Yu Seung-Man
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Abstract
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The purpose of this study is to measure the (air dose rate of radiation dose) the discharged patient who was administrated high dose 131I treatment, and to predict exposure radiation dose in public person. The dosimetric evaluation was performed according to the distance and angle using three copper rings in 30 patients who were treated with over 200mCi high dose Iodine therapy. The two observer were measured using a GM surverymeter with 8 point azimuth angle and three difference distance 50, 100, 150cm for precise radion dose measurement. We set up three predictive simulations to calculate the exposure dose based on this data. The most highest radiation dose rate was showed measuring angle 0°at the height of 1m. The each distance average dose rate was used the azimuth angle average value of radiation dose rate. The maximum values of the external radiation dose rate depending on the distance were 214 ± 16.5, 59 ± 9.1 and 38 ± 5.8μSv/h at 50, 100, 150cm, respectively. If high dose Iodine treatment patient moves 5 hours using public transportation, an unspecified person in a side seat at 50cm is exposed 1.14 mSv radiation dose. A person who cares for 4days at a distance of 1 meter from a patient wearing a urine bag receives a maximum radiation dose of 6.5mSv. The maximum dose of radiation that a guardian can receive is 1.08mSv at a distance of 1.5m for 7days. The annual radiation dose limit is exceeded in a short time when applied the our developed radiation dose predictive modeling on the general public person who was around the patients with Iodine therapy. This study can be helpful in suggesting a reasonable guideline of the general public person protection system after discharge of high dose Iodine administered patients.
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KEYWORD
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radioiodine, thyroid Therapy, exposured dose, I-131
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