A statistical approach to infer the minimum setup distance of a well chamber to the wall or to the floor for 192Ir HDR calibration.
We propose a new method based on statistical analysis technique to determine the minimum setup distance of a well chamber used in the calibration of 192Ir high dose rate (HDR). The chamber should be placed at least this distance away from any wall or from the floor in order to mitigate the effect of scatter. Three different chambers were included in this study, namely, Sun Nuclear Corporation, Nucletron, and Standard Imaging. The results from this study indicated that the minimum setup distance varies depending on the particular chamber and the room architecture in which the chamber was used. Our result differs from that of a previous study by Podgorsak et al. [Med. Phys. 19, 1311-1314 (1992)], in which 25 cm was suggested, and also differs from that of the International Atomic Energy Agency (IAEA)-TECDOC-1079 report, which suggested 30 cm. The new method proposed in this study may be considered as an alternative approach to determine the minimum setup distance of a well-type chamber used in the calibration of 192Ir HDR.
Chang
Liyun
L
Institute of Biochemical Engineering, National Cheng-Kung University, Tainan, Taiwan.
Ho
Sheng-Yow
SY
Chui
Chen-Shou
CS
Lee
Jeng-Hung
JH
Du
Yi-Chun
YC
Chen
Tainsong
T
D002138:Calibration; D007496:Iridium Radioisotopes; D011829:Radiation Dosage
D007496:Iridium Radioisotopes