ASSESSMENT OF RADIATION DOSE RATE LEVELS AND RADIATION RISK AT THE COBALT -60 UNIT, KOMFO ANOKYE RADIOTHERAPY CENTER, GHANA.

Authors

  • Addison E. C. D. K
  • R. A. Opoku
  • Addison C.E.B.N
  • Aniagyei W.I

DOI:

https://doi.org/10.47672/ejt.877

Keywords:

Annual Effective Dose Equivalent, Excess Lifetime Cancer Risk, Cobalt-60 source, Absorbed Dose Rate (ADR), Background Ionizing Radiation (BIR)

Abstract

Purpose: A study was conducted to estimate the Annual Effective Dose Equivalent (AEDE) and Excess Lifetime Cancer Risk (ELCR) caused by the presence of an artificial cobalt-60 radioactive source producing ionizing radiation levels within the radiotherapy facility at Komfo Anokye Teaching Hospital (KATH) in Ghana. This study validated the safety of cobalt-60 radioactive sources, as well as the notion of calculating the Annual Effective Dose Equivalent (AEDE) and Excess Lifetime Cancer Risk (ELCR), which contributed to reducing occupational and public exposures inside the facility.

Methodology: The investigation was carried out with the use of a portable OD-01 Ionization Chamber Survey Meter. The absorbed dose rate (ADR) in air was changed between 5 m and 40 m, with measurements taken inside and around the cobalt 60 bunker, as well as at sixteen other sites within the radiation facility.

Findings: From 5 m to 40 m surrounding the Cobalt-60 source, the estimated Absorbed Dose Rate in air inside the cobalt-60 bunker ranged from 0.299 0.001 to 0.977 0.005 Sv/h, with an average of 0.498 0.005 Sv/h. The estimated Annual effective dose equivalent varied from 1.100 mSv/yr to 3.595 mSv/yr around the cobalt-60 source inside the Co-60 bunker. Radiation exposure levels ranged from 0.268 0.008 Sv/h to 0.678 0.005 Sv/h, with an average of 0.440 0.004 Sv/h observed around the fifteen sites chosen. Excess Lifetime Cancer has values ranging from 3.85 10-3 to 12.58 10-3 and 3.45 10-3 to 8.73 10-3. Risks were evaluated for the cobalt and the sixteen places inside the plant. The absorbed dose values at 5 m, 10 m, and 15 m inside the Co-60 bunker and the location Co-60 bunker as part of the facility exceeded the ICRP-recommended limit of 0.57. The AEDE and ELCR levels were within the ICRP's acceptable limits. The AEDE and ELCR statistics acquired indicate that the Cobalt-60 unit and its surroundings are radiation safe, although the likelihood of employees contracting cancer from the absorbed dose and background ionizing radiation is significant over a lifetime.

Recommendation: However, it is recommended that absorbed dose level monitoring and evaluation of the Radiation Therapy Technologist (RTT) and other workers surrounding the unit be monitored on a regular basis. It is also recommended that Occupational Staff, such as RTTs, spend as little time as possible in the bunker

 

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Author Biographies

Addison E. C. D. K

Physics Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.

Oncology Directorate, Komfo Anokye Teaching Hospital, Kumasi, Ghana.

R. A. Opoku

Physics Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.

Addison C.E.B.N

Oncology Directorate, Komfo Anokye Teaching Hospital, Kumasi, Ghana.

Aniagyei W.I

Oncology Directorate, Komfo Anokye Teaching Hospital, Kumasi, Ghana.

References

Akram, M., Zulkafal, H. M. U., Altaf, S., Iqbal, K., Khan, M. A., & Buzdar, S. A. (2018). Radiation absorbed dose for cobalt-60 gamma source in phantoms for different materials. Journal of the Pakistan Medical Association, 68(2), 264-267.

Darrar, A. S., Mahmoud, R. M. M., EzzEl-Din, M. R., Khalaf, A. M., & Mostafa, A. G. (2019). Risk assessment for occupational potential exposure at cobalt teletherapy units. Journal of Radiation Research and Applied Sciences, 12(1), 140-146. https://doi.org/10.1080/16878507.2019.1618090

Emelue, H. (2014). Excess Lifetime Cancer Risk due to Gamma Radiation in and Around Warri Refining and Petrochemical Company in Niger Delta, Nigeria. British Journal of Medicine and Medical Research, 4(13), 2590-2598. https://doi.org/10.9734/bjmmr/2014/7180

Ezekiel, A. O. (2017). Assessment of excess lifetime cancer risk from gamma radiation levels in Effurun and Warri city of Delta state, Nigeria. Journal of Taibah University for Science, 11(3), 367-380. https://doi.org/10.1016/j.jtusci.2016.03.007

Ferlay, J., Shin, H. R., Bray, F., Forman, D., Mathers, C., & Parkin, D. M. (2010). Estimates of worldwide burden of cancer in 2008: GLOBOCAN 2008. International Journal of Cancer, 127(12), 2893-2917. https://doi.org/10.1002/ijc.25516

Harb, S. (2016). Evaluation of Radiation doses and Radiation Risk in Teaching Sohag Hospital, Egypt. Journal of Nuclear and Particle Physics, 6(4), 88-93. https://doi.org/10.5923/j.jnpp.20160604.03

James, I., Moses, I., Vandi, J., & Ikoh, U. (2015). Measurement of Indoor and Outdoor Background Ionising Radiation Levels of Kwali General Hospital, Abuja. Journal of Applied Sciences and Environmental Management, 19(1), 89. https://doi.org/10.4314/jasem.v19i1.12

Jemal, A., Bray, F., & Ferlay, J. (1999). Global Cancer Statistics: 2011. CA Cancer J Clin, 49(2), 1,33-64. https://doi.org/10.3322/caac.20107.Available

Jwanbot, D. I., Izam, M. M., Nyam, G. . G. ., & Agada, I. S. (2012). Evaluation of Indoor Background Ionizing Radiation Profile in Some Hospitals in Jos, Plateau State-Nigeria. Journal of Natural Sciences Research, 2(7), 35-40. Retrieved from https://www.iiste.org/Journals/index.php/JNSR/article/view/2763

L.Bamidele. (2013). Measurement of Ionizing Radiation Level in an High Altitude Town of Imesi-Ile, Osun State, Southwestern, Nigeria. Medwell Journals, 7(4-6), 79-82.

Niu, S. (2011). Radiation protection of workers. Retrieved from https://www.ilo.org/global/topics/safety-and-health-at-work/resources-library/publications/WCMS_154238/lang--en/index.htm

Ravichandran, R. (2009). Has the time come for doing away with Cobalt-60 teletherapy for cancer treatments. Journal of Medical Physics, 34(2), 63-65. https://doi.org/10.4103/0971-6203.51931

Streffer, C. (2007). The ICRP 2007 recommendations. Radiation Protection Dosimetry, 127(1-4), 2-7. https://doi.org/10.1093/rpd/ncm246

Sung, H., Ferlay, J., Siegel, R. L., Laversanne, M., Soerjomataram, I., Jemal, A., & Bray, F. (2021). Global cancer statistics 2020: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA: A Cancer Journal for Clinicians, 0(0), 1-41. https://doi.org/10.3322/caac.21660

Taskin, H., Karavus, M., Ay, P., Topuzoglu, A., Hidiroglu, S., & Karahan, G. (2009). Radionuclide concentrations in soil and lifetime cancer risk due to gamma radioactivity in Kirklareli, Turkey. Journal of Environmental Radioactivity, 100(1), 49-53. https://doi.org/10.1016/j.jenvrad.2008.10.012

Temaugee, S. T., Daniel, T. A., Oladejo, K. O., & Daniel, S. (2014). Assessment of Public Awareness of the Detrimental Effects of Ionizing Radiation in Kontagora , Niger State , Nigeria. International Journal of Science and Technology, 4(7), 134-141.

The 2007 Recommendations of the International Commission on Radiological Protection. ICRP publication 103. (2007). Annals of the ICRP, 37(2-4), 1-332. https://doi.org/10.1016/j.icrp.2007.10.003

UNSCEAR. (1993). Sources and Effects of Ionising Radiation 1993. Report to the General Assembly.

UNSCEAR. (2008). Sources and Effects of Ionizing Radiation United Nations Scientific Committee on the Effects of Atomic Radiation UNSCEAR 2008 Report. https://doi.org/10.1093/oxfordjournals.rpd.a079988

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Published

2021-12-17

How to Cite

Addison , E. C. D. K., Opoku, R. A., Addison , C. E. B. N., & Aniagyei , W. I. (2021). ASSESSMENT OF RADIATION DOSE RATE LEVELS AND RADIATION RISK AT THE COBALT -60 UNIT, KOMFO ANOKYE RADIOTHERAPY CENTER, GHANA. European Journal of Technology, 5(1), 34–51. https://doi.org/10.47672/ejt.877

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