8/14/2023 0 Comments Cobalt 60 machine![]() ![]() The highest measurement at the controlled area for this study was 3.44 μSv/h and that of Opoku et al. whose highest IDR at the control console was 0.3 μSv/h, which can be estimated over 8 h to give a TADR value of 2.4 μSv/h. RESULTS: The mean TADR at beam OFF position in the controlled area at four different areas was 2.15 ± 0.48 μSv/h, which was 7.5 μSv/h, the highest TADR at the control console was 2.64 μSv/h, this value was seen to be close to those obtained by Opoku et al. In addition, measurement was made at 1 m from the normal treatment distance in patient and nonpatient planes. Instantaneous dose rate (IDR) for leakage radiation was measured at 5 cm from the source head using the same Survey Meter and a measuring tape. A RadEye ™ B20-ER Multi-Purpose Survey Meter was used to measure mean time-average dose rate (TADR) at various points in the controlled and supervised areas. MATERIALS AND METHODS: The machine used was a Theratron ® Phoenix Cobalt 60 Teletherapy machine. Although as the machine wear, the chances of leakage radiation increase.ĪIMS AND OBJECTIVES: The aim of this study was to determine if leakage radiation at 5 cm and 1 m from the Co-60 teletherapy source head is within the acceptable tolerance limit set by the International Electro-technical Commission (IEC) and to determine if controlled and supervised areas within working hours were within the Institute of Physics and Engineering in Medicine (IPEM) limit. BACKGROUND: Cobalt-60 (Co-60) teletherapy machines are still in use in most developing countries because of their minimal power requirements, reduced operational cost, and since the source does not vary in energy, the amount of quality assurance required to ensure “good beam” is dramatically reduced. ![]()
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