| 马永忠,万玲,娄云,等.螺旋断层放射治疗室内泄漏辐射与散射辐射监测与评价研究[J].中华放射医学与防护杂志,2013,33(4):431-435.MA Yong-zhong,WAN Ling,LOU Yun,et al.A study on monitoring and assessment of leakage and scattering radiation in a helical tomotherapy room[J].Chin J Radiol Med Prot,2013,33(4):431-435 |
| 螺旋断层放射治疗室内泄漏辐射与散射辐射监测与评价研究 |
| A study on monitoring and assessment of leakage and scattering radiation in a helical tomotherapy room |
| 投稿时间：2013-05-15 |
| DOI：10.3760/cma.j.issn.0254-5098.2013.04.028 |
| 中文关键词: 螺旋断层放射治疗 泄漏辐射 散射辐射 放射防护 |
| 英文关键词:Helical tomotherapy Leakage radiation Scattering radiation Radiation protection |
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| 中文摘要: |
| 目的 检测螺旋断层放射治疗(TOMO)室内泄漏辐射与散射辐射的剂量水平,揭示TOMO室内与常规放射治疗不同的剂量分布规律,为TOMO放射防护提供科学依据。方法 以Tomotherapy Hi-Art TOMO装置为出束治疗设备,在模拟治疗照射条件下累积出束100 Gy,使用GR-200A型LiF(Mg,Cu,P)热释光剂量计(TLD),测量治疗床平面不同方向和TOMO室内空间泄漏辐射和散射辐射的空气比释动能,求出各测量位点的泄漏辐射比和散漏(散射+泄漏)辐射比(辐射比为测量点的辐射剂量与等中心点处标准治疗的输出剂量之比)。结果 TOMO室内泄漏辐射与散射辐射的剂量水平均基本以旋转等中心和治疗床纵轴呈左右对称分布,治疗设备前方的辐射水平明显高于设备后方;治疗床平面上,距等中心100 cm处的泄漏辐射比最高值仅为1.3×10-4,距等中心300 cm处的泄漏辐射比均不高于2.0×10-5;距等中心200~300 cm处的散射辐射仅为相应位置泄漏辐射的25%~30%,室内散射辐射相对于泄漏辐射衰减更快。结论 TOMO室内泄漏和散射辐射水平远低于常规放射治疗室内的辐射水平。 |
| 英文摘要: |
| Objective To study the radiation dose level and dose distribution of leakage and scattering radiation in a helical tomotherapy(TOMO) room,and to identify the dose distribution characteristic which is different from the conventional radiotherapy so as to provide scientific data for the radiation protection of TOMO. Methods A helical tomotherapy facility typed Tomotherapy Hi-Art was employed as the radiotherapy device. The air kerma from leakage radiation and scattering radiation distributed on the couch plane and in TOMO room were detected mainly by GR-200A TLDs of LiF(Mg,Cu,P), while 100 Gy were being accumulated under the condition of simulation radiation treatment. Then, the leakage radiation ratio and scattering-leakage radiation ratio (the ratio of site radiation dose to isocenter standard output dose) were calculated. Results The radiation level and dose distribution of leakage radiation and scattering radiation in the TOMO treatment room were in bilateral symmetry to the rotation isocenter and the treatment couch longitudinal axis, and the radiation level in front of the radiotherapy device was significantly higher than that of the rear of the TOMO equipment. In the plane of treatment couch, the maximum leakage radiation ratio at the position 100 cm away from the isocenter was only 1.3×10-4, and the mean value of the leakage radiation ratio at the position 300 cm away from the isocenter was lower than 2.0×10-5. The scattering radiation at 200-300 cm away from the isocenter was accounted for 25%-30% of the leakage radiation from the responding sites, and the indoor scattering radiation decreased faster than leakage radiation with the distance from the isocenter. Conclusions The radiation level of leakage and scattering in a TOMO room is significantly lower than that in a conventional radiotherapy room. |
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