Objective To investigate the quality control and protection level of medical electron linear accelerators in Shanghai, China. Methods The startified random sampling method was used to cover tertiary, secondary and ungraded hospitals, and a total of 30 medical electron linear accelerators in 15 hospitals were tested for quality control and protection level according to relevant standards. Results Five medical electron linear accelerators failed the quality control test, with an overall inspection pass rate of 83.3% and a re-inspection pass rate of 100%. The pass rate of flatness of square X-ray irradiation field (5 cm × 5 cm)-(30 cm × 30 cm) was 83.3%, the pass rate of symmetry of square X-ray irradiation field was 96.7%, and other indices were qualified. All medical electron linear accelerator rooms passed the protection test. Conclusion The protection of medical electron linear accelerator rooms in Shanghai meets the requirements of national standards, and some indices do not meet the requirements of national standards in the preliminary inspection. The quality control of medical electron linear accelerators should be further strengthened to ensure the treatment effect of patients.

Objective:To understand the radiation protecton awareness of clinical staff for patients, and to provide strategies and suggestions for promoting the justification of medical exposure.Methods:From June to September 2023, 1 430 physicians or technicians from 10 tertiary hospitals, 9 secondary hospitals and 8 primary hospitals in Shanghai were selected by multi-stage stratified random sampling method to conduct a questionnaire survey about radiation-related cognition through a combination of offline and online survey. The contents of the questionnaire included the characteristics of the respondents, the training of radiation protection, the self-awareness of patients on radiation protection, the actual cognition of the basic knowledge of ionizing radiation, the cognition of the dose caused by different types of the radiological examinations, and the ways to access knowledge of ionizing radiation. SPSS software was used for statistical analysis.Results:A total of 1 229 valid questionnaires were received, of which 82.10% respondents belonged to the clinical department and 17.90% belonged to the radiology department. 58.37% of the respondents in clinical department have received radiation-related training, and 98.64% in radiology department have done so. The overall mastery of radiation protection-related knowledge in radiology department was better than in clinical department, and the difference was statistically significant ( χ2=39.58, P<0.05). Most of the respondents tended to underestimate the radiation dose to patients from CT scans, and the proportion of the respondents who underestimated the CT doses to different sites was all greater than 45%. Logistic regression analysis showed that the contributing factors affecting radiation protection cognition are a combination of technical titles, radiation protection training to a varing degree, the level of medical institutions and their majors (95% CI of the OR values did not include 1, χ2=5.66-28.26, P<0.05). Conclusions:Most clinical staff have realized the importance of controlling the radiation dose in radiological examinations, but there is less understanding of the dose magnitude caused by different radiological examinations. Education and training are the best way to improve the awareness of ionizing radiation. Radiation protection training should be integrated into general medical education or standardized training for physicians.

ObjectiveTo analyze the individual monitoring results of the radiation workers in Shanghai’s Jing’an District from 2017 to 2023, to assess the occupational protection status as well as to offer scientific references for enhancing occupational health and radiation safety, and to provide support for health education initiatives targeting radiation workers. MethodsRadiation workers from several medical institutions in Jing’an District from 2017 to 2023 were selected as the subjects for this study. The individual dose of occupational external radiation exposure was monitored by using thermoluminescence dosimeters. Continuous data of seven years were statistically analyzed using SPSS 20.0. ResultsFrom 2017 to 2023, the annual collective effective dose for radiation workers in Jing’an District was 329.53 person·mSv, with an average individual annual effective dose of 0.17 mSv, and the median individual annual effective dose was 0.12 mSv. There were statistically significant differences in the individual annual effective doses across different years (H=277.131, P<0.05). The individual doses varied significantly among different levels of medical institutions (H=46.097, P<0.05), with tertiary institutions having the lowest median individual dose of 0.09 mSv, which was significantly lower than those at primary, secondary, and ungraded institutions (P<0.05). The median annual effective dose in males was lower than that in females, showing a statistically significant difference (Z=-3.438, P<0.05). There were significant differences in the individual annual effective doses among different occupational categories (H=150.727, P<0.05), with nuclear medicine workers experiencing the highest median annual dose of 0.56 mSv. ConclusionFrom 2017 to 2023, the individual dose of radiation workers in medical institutions in Jing’an District of Shanghai remained at a low level, reflecting the effective measures of radiation protection facilities in workplaces in Jing’an District, but particular attention should be given to radiological workers in nuclear medicine and workers in primary medical institutions.

Background Individual monitoring of occupational external exposure is an essential part of the occupational health management of radiation workers, and is an important basis for the evaluation of individual absorbed dose and the diagnosis of occupational radiation diseases. Continuous participation of monitoring service providers in intercomparison is a fundamental quality assurance for routine monitoring, which can identify problems and improve them in time. Objective Taking the Laboratory of Radiation Protection in Shanghai Institute of Preventive Medicine as an example, to evaluate the performance of an individual occupational external dose monitoring system in the laboratory, identify influencing factors of the monitoring results, and provide a basis for improving the quality of daily monitoring by analyzing the process and results of a national intercomparison of individual dose monitoring. Methods According to the Testing criteria of personnel dosimetry performance for external exposure (GBZ 207-2016), and the relevant requirements of Class II (photon) inspection, a total of 20 groups of blind sample dosimeters were measured for four consecutive years from 2018 to 2021. The radiation energy source of each group was identified, and related personal dose equivalent H_p(10), the uncertainty of measurement results, and the deviation between the reported value and the reference value were calculated. The national intercomparison process and results of individual dose monitoring were also analyzed. Results The energy sources of the blind samples in the tested laboratory for four years were N100 or Cs-137. The reported dose values of the blind samples were 0.57-4.61 mSv, the combined uncertainties were 0.043-0.365 mSv, the expanded uncertainties (k=2) were 0.09-0.73 mSv, and the relative expanded uncertainties (k=2) were 13.8%-16.4%. The single-group performance ∣P_i∣ of 20 sets of blind samples in the four years was ≤0.10, the yearly comprehensive performance of 5 sets of blind samples was ≤0.10, and the yearly Q score of the test report was >15 points. The laboratory achieved excellent results in the national intercomparison of individual dose monitoring in four consecutive years, except the Q value not reaching full score. Conclusion The laboratory exhibits standardized data processing of individual dose monitoring, generates accurate and reliable results, and meets the requirements of relevant national standards; but it should continue to participate in the national intercomparison of individual dose monitoring, strengthen the angular response research of energy identified dosimeter, improve the monitoring ability of low-dose X-rays, analyze the key points of reducing the uncertainty of measurement results, and continuously improve the monitoring ability.