Evaluation of Lens Dose according to the Shield Type during Administration of Radiopharmaceuticals

방사성의약품 투여 시 차폐 종류에 따른 수정체선량 평가

  • Received : 2018.01.04
  • Accepted : 2018.02.17
  • Published : 2018.03.31

Abstract

Radiation workers in nuclear medicine use radioisotopes for diagnostic evaluation and treatment, so Their risk of radiation exposure of the lens is greater than for other medical staff. Furthermore, the ICRP report 118 has suggested to reduce the occupational equivalent dose limit for the lens from $150mSv{\cdot}year^{-1}$ to 20 mSv in a year, averaged over defined periods of 5 years, with no single year exceeding 50 mSv. Therefore, the radiation worker in nuclear medicine may have risk to exceed the equivalent dose limit of the lens. To evaluate the performance of the shield for lens protection, the dose of the lens was measured using an ED3 electron dosimeter. During administration of the radiopharmaceuticals, lens dose was measured in non-shielding and with syringe shield, lead glass, and L-block. Also, based on the measured doses, Calculated the dose per 1 mCi of used radioisotope to help make the work plan. Additionally, compared the measurements of the OSL and ED3 over 6 month period to evaluate whether the lens dose of OSL could replace the ED3 measurements.

Keywords

Acknowledgement

Supported by : Korea Radiation Safety Foundation (KORSAFe), Nuclear Safety and Security Commission (NSSC)

References

  1. 원자력안전위원회. 2014. 개인 피폭방사선량의 평가 및 관리에 관한 규정. 원자력안전위원회고시 제2014-69호.
  2. 원자력안전위원회. 2016. 원자력안전법 시행령 대통령령 제27678호.
  3. 원자력안전위원회. 2016. Establishment of Dose Constrains for Radiation Workers in Nuclear Medicine. NSTAR-15NS11-01.
  4. Behrens R and Dietze G. 2010. Monitoring the eye lens: which dose quantity is adequate?. Phys. Med. Biol. 55(14):4047-4062. https://doi.org/10.1088/0031-9155/55/14/007
  5. Cabral G, Amaral A, Campos L and Guimaraes MI. 2002. Investigation of maximum doses absorbed by people accompanying patients in nuclear medicine departments. Radiat. Prot. Dosim. 101(1):435-438. https://doi.org/10.1093/oxfordjournals.rpd.a006020
  6. Cho JK, Cho HS and Han TJ. 2007. Efficacy of Lens Shielding Device to Prevent Cataract with Radiotherapy for Orbit or Ocular Adnexal Tumor. J. Korea Cont. Assoc. 7(12):139-144. https://doi.org/10.5392/JKCA.2007.7.12.139
  7. ICRP. 1990. 1990 Recommendations of the International Commission on Radiological Protection. ICRP Publication 60. Pergamon Press, New York.
  8. ICRP. 2007. The 2007 Recommendations of the International Commission on Radiological Protection. ICRP Publication 103. Pergamon Press, New York.
  9. ICRP. 2012. ICRP Statement on Tissue Reaction and Early and Late Effects of Radiation in Normal Tissues and Organs-Threshold Doses for Tissue Reactions in a Radiation Protection Context. ICRP Publication 118. Pergamon Press. Oxford.
  10. ICRU. 1993. Quantities and units in radiation protection dosimetry. ICRU Report 51. Bethesda.
  11. Kang KW, Song HJ, KIm HG, Dong KR, Kim MH and Chung WK. 2017. Evaluation of Lens Dose of Nuclear Medicine Radiation Workers. J. Radia. Ind. 11(4):241-250.
  12. St Germain J. 1986. The radioactive patient. Semin. Nucl. Med. 16(3):179-183. https://doi.org/10.1016/S0001-2998(86)80033-2