CAJ | 학술논문

目的研究市内电压变化对BJ-6B加速器剂量率、剂量传递准确性的影响.方法在变压器332V时校准加速器.模拟市内电压变化在321～338V范围改变变压器输出电压,监测剂量率变化.在机器出束为100 MU,照射野为10 cm×10 cm,源皮距离为100 cm,水模体射野中心轴为1.5、5.0、10.0 cm深度处时测量吸收剂量5次求平均值.分析变压器输出电压对剂量率、剂量传递准确性影响.结果市内电压变化对剂量率有影响.在一定变化范同内变压器输出电压增加加速器输出剂虽率增加,水模中射野中心轴线上不同深度处吸收剂量增加.结论为BJ-6B加速器配备高精度的稳压器非常重要,用户在使用时务必把稳压器稳压精度调整到最高.
목적 연구시내전압변화대BJ-6B가속기제량솔、제량전체준학성적영향.방법 재변압기332V시교준가속기.모의시내전압변화재321～338V범위개변변압기수출전압,감측제량솔변화.재궤기출속위100 MU,조사야위10 cm×10 cm,원피거리위100 cm,수모체사야중심축위1.5、5.0、10.0 cm심도처시측량흡수제량5차구평균치.분석변압기수출전압대제량솔、제량전체준학성영향.결과 시내전압변화대제량솔유영향.재일정변화범동내변압기수출전압증가가속기수출제수솔증가,수모중사야중심축선상불동심도처흡수제량증가.결론 위BJ-6B가속기배비고정도적은압기비상중요,용호재사용시무필파은압기은압정도조정도최고.
Objective To study the impact of main source voltage fluctuation on dose rate and dose delivery accuracy of BJ-6B accelerator. Methods The accelerator was calibrated by a voltage regulator at an output voltage of 332 V. The main source voltage fluctuation was simulated by changing the output of voltage regulator within the range of 321 - 338 V. The change of dose rate was recorded. Using a water phantom, each absorption dose was measured five times and averaged along the central beam axis at the depth of 1.5 cm, 5 cm and 10 cm, respectively, with the conditions of monitor unit: 100 MU ,field: 10 cm× 10 cm and SSD = 100 cm. The impact of voltage fluctuation on dose rate and dose delivery of BJ-6B accelerator was analyzed. Results Voltage fluctuation had an significant effect on dose rate. In a certain range, dose rate and absorption dose at different depths increased as the output voltage increased. Conclusions It is essential to equip the BJ-6B accelerator with a high accurate voltage stabilizer, and the voltage stabilizer must be adjusted to its highest accuracy.