Abstract: Objective To investigate and master the status of understanding and application of the technical indexes and existing problems of GBZ/T 201.3-2014 "Radiation shielding specification for radiotherapy room Part 3：Radiotherapy room of γ-ray sources",aiming to provide technical support for the in-depth implementation and further revision and improvement of the standard. Methods According to the WS/T 536-2017 "Guideline for health standards tracking evaluation",the method of combining cluster sampling and stratified sampling was used to select the relevant business personnel of γ-ray source radiotherapy devices,which from 20 provinces（autonomous regions and municipalities directly under the Central Government） were confirmed as the survey objects,and a special questionnaire was developed to conduct a questionnaire survey on them. The basic information of investigators and their understanding and application of technical indicators in the standard were collected,and a special database was established for statistical analysis using SPSS 21.0. A total of 259 valid questionnaires were collected,with an effective rate of 98.85%. Results Totally 133 were technology-related investigators and 126 were medical-related investigators. Among the respondents,bachelor degree and associate senior title were the most,accounting for 56.76% and 43.24% of the respondents,respectively. 74.51% of the respondents had 5 years or more of radiotherapy-related work experience,and 42.08% of the respondents had received training of the standard. The number of people who applied the standard at least once a year accounted for 23.17% of the respondents,99.61% of respondents knew the standard to some extent and believed that it was widely used,93.05% of the investigators believed that the performance parameters related to the shielding of the radiotherapy room of γ-ray sources in the standard were complete,98.46% of the investigators believed that the parameters of the example of radiotherapy room of γ-ray sources in appendix of the standard were comprehensive or very comprehensive,89.96% or more of the investigators could correctly identify the location parameters to be considered in the shielding calculation of the radiation therapy room,and 81.47% or more of the investigators could accurately identify the radiation beam types involved in the shielding calculation method. There was no significant difference in determining the rationality of dose-control indexes of radiotherapy room of γ-ray sources among investigators of different categories,educational/academic degrees and technical titles（all P>0.01）. Conclusion GBZ/T 201.3-2014 "Radiation shielding specification for radiotherapy room Part 3：Radiotherapy room of γ-ray sources" basically meets the needs of radiation shielding estimation and protection design in radiotherapy room of γ-ray sources basically. Relevant personnel can correctly understand and apply the technical indicators of the standard,but it should be revised and improved in combination with the problems existing in the implementation of the standard and the need of the radiotherapy equipment and technology with γ-ray sources updating.

Key words: Occupational health standard, Radiotherapy room of γ-ray sources, Technical index, Questionnaire survey