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| Research on Radiation Field Dosage Distribution of 60Co Treatment Room |
| XV Xiao, HA Ri-ba-la, GE Ri-le-man-da-hu, WANG Hai-ling, WANG Cheng-guo |
| Inner Mongolia Center For Disease Control and Prevention, Hohhot 010031 China |
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Abstract Objective To provide the basic data for design of radiation shielding and quality control of radiation treatment equipment, establish the estimation method for γ-radiation field and investigate,the radiation field dosage distribution of 60Co treatment room has been investigated,where there is a 60Co Tele-therapy equipment with photon flux. Methods The dose distribution of γ-radiation field has been measured using thermoluminescence dosimetry under 60Co equipment normal operation condition. Results At the same height plane,each of dose distribution with 2π range at the identical distance from central axis is consistent with relative standard deviation of measured values and average values being less than 3.9%, the dose values at different direction go down exponentially with increasing distance from central axis. At the different height plane, the doses on the ground are highest,and the dose values are uniformly distributed at the space 3 m above the ground. Conclusion It is feasible and effective that the dosage distribution of medicine 60Co Tele-therapy equipment can be measured using thermoluminescence dosimetry method. The function for the description of radiometric quantity derivate by the experimental data can be used for design of radiation protection.
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Received: 25 April 2015
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