Assessment of annual whole-body occupational radiation exposure in medical practice in Ghana (2000-09)

Abstract

Occupational exposure to radiation in medical practice in Ghana has been analysed for a 10-y period between 2000 and 2009. Monitored dose data in the medical institution in Ghana from the Radiation Protection Institute's database were extracted and analysed in terms of three categories: diagnostic radiology, radiotherapy and nuclear medicine. One hundred and eighty medical facilities were monitored for the 10-y period, out of which ~98% were diagnostic radiology facilities. Only one nuclear medicine and two radiotherapy facilities have been operational in the country since 2000. During the 10-y study period, monitored medical facilities increased by 18.8%, while the exposed workers decreased by 23.0%. Average exposed worker per entire medical institution for the 10-y study period was 4.3. Annual collective dose received by all the exposed workers reduced by a factor of 4 between 2000 and 2009. This is seen as reduction in annual collective doses in diagnostic radiology, radiotherapy and nuclear medicine facilities by ~76, ~72 and ~55%, respectively, for the 10-y period. Highest annual collective dose of 601.2 man mSv was recorded in 2002 and the least of 142.6 man mSv was recorded in 2009. Annual average values for dose per institution and dose per exposed worker decreased by 79 and 67.6%, respectively between 2000 and 2009. Average dose per exposed worker for the 10-y period was least in radiotherapy and highest in diagnostic radiology with values 0.14 and 1.05 mSv, respectively. Nuclear medicine however recorded average dose per worker of 0.72 mSv. Correspondingly, range of average effective doses within the diagnostic radiology, radiotherapy and nuclear medicine facilities were 0.328-2.614, 0.383-0.728 and 0.448-0.695 mSv, respectively. Throughout the study period, an average dose per medical institution of 3 mSv and an average dose per exposed worker of 0.69 mSv were realised. Exposed workers in diagnostic radiology primarily received most of the individual annual doses >1 mSv. The entire study period had 705 instances in which exposed workers received individual annual doses >1 mSv. On thermoluminescent dosemeter (TLD) return rates, facilities in Volta and Eastern Regions recorded highest return rates of 94.3% each. Ashanti Region recorded the least TLD return rate with 76.7%.

Radiation dose assessment for occupationally exposed workers in Malawi

“…The study found out also that there was no quality control program in any of the surveyed hospitals except in radiotherapy facilities. 10 Table 4: Comparision of individual dose results in different countries [5][6][7][8]…”

Variation of annual effective dose from external ionizing radiation among radiation workers of Bahawalpur Institute of Nuclear Medicine and Oncology (BINO), Pakistan

“…medical uses (23) , the number of workers in radiation therapy, nuclear medicine and radiology departments and their average annual effective doses are presented in Table 3. Higher doses of radia on workers as reported by various researchers (17)(18)(19)(20)(21)(22) .…”

“…Table 7. Comparison of average annual effec ve doses in Nuclear Medicine, Radia on Therapy and Radiology in present inves ga on with other researchers (14,(19)(20)(21)(24)(25)(26) .…”

“…The result of annual average effective dose (AAED) is a sign of general tendency of (17)(18)(19)(20)(21)(22) are listed in table 3 for comparison. The results of current analysis are comparable to other researchers (17)(18)(19)(20)(21)(22) .…”

“…S. A. Memon et al (17) 3.6 G. K. Korir et al (18) 7.4 H. Piwowarska-Bilska et al (19) 9.5 F. Hasford et al (20) 9.8 K. Masood (21) 7.42 S. A. Memon et al (22) 7.78 Current Study 4.95 Table 4. The distribu on of number of radia on workers (NOW) and their annual average effec ve doses (AAED) in mSv as well as standards devia on (SD) during 2000-13 in radia on therapy, nuclear medicine and radiology.…”