Calculation of superficial and deep absorption dose of 131 radioactive iodine in the patient's thyroid and around the patient after thyroid tissue surgery or thyroidectomy using thermoluminescence dosimeter

Khosravi, S.; Shafaei, M.A.; Zand, V.

doi:10.24200/nst.2022.1346

Calculation of superficial and deep absorption dose of 131 radioactive iodine in the patient's thyroid and around the patient after thyroid tissue surgery or thyroidectomy using thermoluminescence dosimeter

Document Type : Research Paper

Authors

S. Khosravi ¹

M.A. Shafaei ¹

V. Zand ²

¹ Nuclear Physics Division, Department of Physics, Science Schools, Yazd University, P.O.Box: 89195-741, Yazd - Iran

² Department of Otolaryngology Head and Neck surgery, Shahid Sadoughi University of Medical Science, Postal code: 891588757,Yazd - Iran

https://doi.org/10.24200/nst.2022.1346

Abstract

One of the most effective methods of treating thyroid cancer is iodine therapy. Patients are prescribed orally after thyroidectomy or thyroid tissue resection to control tumor growth and prevent secondary symptoms after iodine surgery. Also, due to the dose of radioactive iodine absorbed by cancer cells in the thyroid gland, it may have many side effects for those around the patient, which in this study in the radiotherapy center of Afshar Clinic in Yazd, using germanium dosimeters TLD-100 is the average absorbed dose of thyroid area on the skin surface after 24 hours to receive 100 to 150 mCi of iodine 131 and the deeply absorbed dose of thyroid at a distance of 7 cm from the skin, which includes the thyroid and surrounding soft tissue 388.933 and 379.155 cGy, respectively. After 48 hours, these values were 350.643 and 344.124 cGy, respectively. Moreover, the measured dose was around the patient. At distances of 1 to 3 m from them during 24 to 48 hours of hospitalization after radiation, iodine intake is on average 30.93 cGy, which is a high risk for those around the patient compared to the set standards. According to the results of studies published so far, age and gender are very effective in the incidence of this disease, and its prevalence is higher in women than men. Therefore, it is suggested that research be conducted on genetic factors and common underlying diseases in each region.

Highlights

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Keywords

Thyroid radio iodine therapy

Dosimetry

Thyroid cancer

I-131

Thermoluminescence Dosimetry (TLD)

20.1001.1.17351871.1401.43.1.3.6

4. A. Shiryazdi, Measurement of dose of non-involved organs in radiation therapy of breast cancer using thermoluminescence dosimeter, School of Physics, 63 -75 (2018) (In Persian).

7. A. Shirazi, et al, Monte Carlo simulation of TLD response function: Scattered radiation field application, Rep Pac Oncol Radiother, 13(1), 23-8 (2008) (In Persian).

9. D. Shahbazi, Z, Shahi, Estimation of salivary gland absorbed dose in the treatment of thyroid with radioactive iodine, Iranian Journal of Nuclear Medicine, 15(2), 1 (2008) (In Persian).

11. S. Yazdani, Determination of thyroid absorption dose with TLD dosimeter in the treatment of head and neck cancer in Shahid Ramezanzadeh Radiation Therapy Center, (2019) (In Persian).