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目的分析2003—2012年广东省放射治疗科和核医学科工作人员的职业性外照射个人剂量。方法采用热释光剂量测量方法对放射工作人员进行个人剂量监测并分析有关数据。结果 10年间共监测5 420人,个人受照剂量<5.00 m Sv/年者占总监测人数的99.87%(5 413/5 420);人均年有效剂量为(0.52±0.11)m Sv/年,随年份的增加其总体呈线性下降趋势(P<0.05);实测年集体有效剂量为2.80人·Sv;年个人有效剂量超过5.00 m Sv的人次数分布比为0.001,集体剂量分布比为0.028。放射治疗科人均年有效剂量为(0.44±0.09)m Sv/年,年集体有效剂量为2.00人·Sv,占集体有效剂量的71.43%。核医学科人均年有效剂量为(0.86±0.17)m Sv/年,年集体有效剂量为0.80人·Sv,占集体有效剂量的28.57%。核医学科人均年有效剂量高于放射治疗科(P<0.05)。结论广东省放射治疗科和核医学科放射工作人员的受照剂量监测结果总体满意,个别工作人员防护意识有待加强。
Objective To analyze the personal exposure dose of occupational radiation to staff of Radiotherapy and Nuclear Medicine in Guangdong from 2003 to 2012. Methods The dose of thermoluminescence was used to monitor the radiation dose of personal radiation workers and analyze the data. Results A total of 5 420 individuals were monitored over a 10-year period. Individual exposure dose was less than 5.00 m Sv / year, accounting for 99.87% (5 413/5 420) of the total number of persons monitored. The annual average effective dose per person was (0.52 ± 0.11) m Sv / year, The average annual effective dose was 2.80 persons · Sv and the annual effective dose was more than 5.00 m Sv. The distribution ratio of population was 0.001, and the collective dose distribution ratio was 0.028. The annual average effective dose of radiotherapy department was (0.44 ± 0.09) m Sv / year, the annual effective dose was 2.00 persons · Sv, accounting for 71.43% of the effective dose. The annual average effective dose of nuclear medicine is (0.86 ± 0.17) m Sv / year, and the annual collective effective dose is 0.80 person · Sv, accounting for 28.57% of the total effective dose. The annual per capita effective dose of nuclear medicine is higher than that of radiotherapy (P <0.05). Conclusion The radiation dose monitoring results of radiation workers and nuclear medicine radiologists in Guangdong Province are generally satisfactory. The awareness of individual staff members needs to be strengthened.