DOI QR코드

DOI QR Code

Comparison of the Measured Radiation Dose-rate by the Ionization Chamber and GM(Geiger-Müller) Counter After Radioactive Iodine Therapy in Differentiated Thyroid Cancer Patients

분화성 갑상선암환자의 방사성 요오드 치료시 전리함과 Geiger-Muller계수관에서 방사선량률 측정값 비교

  • Park, Kwang-hun (Department of Nuclear Medicine, Kyungbuk National University Hospital) ;
  • Kim, Kgu-hwan (Department of Radiological Technology, Daegu Health College)
  • Received : 2016.11.07
  • Accepted : 2016.12.22
  • Published : 2016.12.31

Abstract

Radioactive iodine($^{131}I$) treatment reduces recurrence and increases survival in patients with differentiated thyroid cancer. However, it is important in terms of radiation safety management to measure the radiation dose rate generated from the patient because the radiation emitted from the patient may cause the exposure. Research methods, it measured radiation dose-rate according to the elapsed time from 1 m from the upper abdomen of the patient by intake of radioactive iodine. Directly comparing the changes over time, high dose rate sensitivity and efficiency is statistically significant, and higher chamber than GM counter(p<0.05). Low dose rate sensitivity and efficiency in the chamber had lower levels than gm counter, but not statistically significant(p>0.05). In this study confirmed the characteristics of calibrated ionization chamber and GM counter according to the radiation intensity during high-dose radioactive iodine therapy by measuring the accurate and rapid radiation dose rate to the patient explains, discharged patients will be reduced to worry about radiation hazard of family and others person.

방사성 요오드($^{131}I$) 치료는 분화성 갑상선암 환자에서 재발을 감소시키고 생존률을 증가시키나, 환자에서 방출되는 방사능으로 인하여 피폭을 야기시킬 수 있으므로 환자로부터 발생되는 방사선량률을 측정하는 것이 방사선안전관리 측면에서 중요하다. 방사성 요오드($^{131}I$) 치료시 널리 사용되는 측정기 중 전리함과 GM계수관으로 측정된 방사선량률의 감도와 측정효율을 구하였다. 방사성 요오드($^{131}I$)를 150mCi 경구투여 받은 분화성 갑상선암 환자의 상복부로부터 1 m거리에서 경과 시간에 따라 방사선량률을 측정하였다. 시간에 따른 변화를 직접적으로 비교한 결과, 고선량률에서의 감도와 측정효율은 GM계수관보다 전리함이 높게 나타났고, 통계적으로 유의하였다(p<0.05). 저선량률에서의 감도와 측정효율은 GM계수관보다 전리함이 낮게 나타났지만 통계적으로 유의한 차이를 나타내지 않았다(p>0.05). 방사성 요오드($^{131}I$) 치료시에 검 교정이 완료된 전리함과 GM계수관으로 정확하고 신속한 방사선량률을 측정하여 환자에게 설명함으로써 방사성 요오드 치료 후 퇴원하는 환자에게 환자가족 또는 주변 사람들에게 미칠 수 있는 방사선피폭을 예측하고, 불필요한 예단을 줄여줄 수 있을 것이다.

Keywords

References

  1. Cho YH, Kim HS, Park SH, Lee JH, Ha JH, Kim YG. Manufacture of ion chamber measuring instrument for low dose, Journal of Radiation Protection(JRP), 34(4), 190-191, 2009.
  2. Ministry of Science and Technology. Study for an improvement plan of Internal Exposure regulation system of the workers in Nuclear Medicine. MSIP. 4-8, 2004.
  3. Lee GW. Radiation dose rate of out-dinic and admitted patients receiving radioiodine(I-131)therapy. Han-sung University Graduate Diploma thesis, 2007.
  4. International Commission on Radiological Protection. Release of patients after therapy with unsealed radionuclides, ICRP, Publiccation 94, 2004.
  5. Kim CB, Lee JS, An BC, Kim GS, An HY, Son MS. A Study on Acceptance Criteria on Patient to Patient Dose in I-131 Therapy Ward. Conference Proceedings. Radiation Protection Society. 190-191, 2010.
  6. Ministry of Education and Science Technology (MEST). Preparation of a guidebook for radiation Safety in educational institutes, MEST, 137-150, 2008.
  7. Choi GU, Won SH, Kim JH, Ha SH, Lee CY, Kim HM, Lee MG. Development of a Techniques of the Performance Test for a Radiation Protection Devices and it's International Standards, Journal of Radiation Protection(JRP), 33(1), 1-12, 2008.
  8. Jo DH. Development of fiber-optic dosimeter for measuring skin dose, percentage depth dose and absorbed dose with high energy photon beams. Kon-kuk University Graduate Diploma thesis. 2009.
  9. Go SJ, Kim SG, No KS, Park MH, An BS. Radiation measurement, 77-119, 2nd ed. In: Lee ST, eds. PA : Cheong-gu Co, 2005.
  10. International Atomic Energy Agency(IAEA). Calibration of radiation protection monitoring instrument. IAEA safety Report Series No.16. 2000.