⁵⁷Co 밀봉선원의 노후도에 따른 균일도의 변동과 중첩사용에 관한 유용성 평가

Evaluation of QC Value Variation and Overlapping Use According to Aging of ⁵⁷Co Sealed Source

Purpose The change in uniformity due to the decreasement in dose should be known. ⁵⁷Co sealed sources are easy to manage and use as QC sources replacing 99mTc. Overlapping sealed sources are expected to show variations in dose due to attenuation between sealed sources. Materials and Methods A total of three experiments were conducted. The first experiment is to observe the change in the degree of senescence of the ⁵⁷Co sealed source. The second experiment is to compare the single source and overlaped source at similar doses. In the third experiment, the sources of different doses were compared on each other to determine the changes due to the attenuation between the overlapping sources. Results The results of the first experiment did not exceed the acceptable range. but each crew showed a difference. There was no statistically significant difference in the measurement of uniformity on second and third experiment Conclusion It is believed that a ⁵⁷Co sealed source can be used as a superimposed source. It is not only economical but also convenient to use. daily uniformity measurements will help reduce scan time and speed up the testing process