| 王晓峰,宋培峰,许忠扬.正电子湮灭产生γ光子的屏蔽计算探讨[J].中华放射医学与防护杂志,2013,33(6):658-661 |
| 正电子湮灭产生γ光子的屏蔽计算探讨 |
| Radiation protection shielding computation of gamma photons produced in positron annihilation |
| 投稿时间：2013-09-08 |
| DOI：10.3760/cma.j.issn.0254-5098.2013.06.025 |
| 中文关键词: 正电子 屏蔽计算 18F 十分之一衰减厚度 正电子发射断层摄影 |
| 英文关键词:Positron Radiation protection calculating 18F Tenth-value layers PET |
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| 中文摘要: |
| 目的 探讨正电子湮灭产生γ光子的辐射防护最佳屏蔽计算方法。方法 以18F为典型核素，分别采用不同方法或文献关于剂量常数及十分之一衰减厚度（TVL）的计算或推荐值，以铅为屏蔽材料进行计算分析。结果 以1周40个患者、每个患者给药555 MBq，1 h的受药时间、1 h的候诊时间的情况为例，采用点源模型计算的剂量常数（0.142 μSv·m2·MBq-1·h-1）及NCRP推荐的铅的TVL值计算的屏蔽厚度最大，控制区单位铅屏蔽厚度为7.562×10-4mm·MBq-1；采用AAPM TG108推荐的剂量常数（0.092 μSv·m2·MBq-1·h-1）及IAEA推荐的铅的TVL值计算结果最小，单位铅屏蔽厚度为4.982×10-4mm·MBq-1。两者相差33.2%。 结论 推荐采用AAPM TG 108工作组推荐的剂量常数及铅的TVL进行屏蔽计算。屏蔽规划设计时应充分考虑距离防护，设立患者卫生间，考虑医患分流。 |
| 英文摘要: |
| Objective To study the best method of radiation protection shielding calculation for the gamma photon produced in positron annihilation. Methods With 18F as the typical of nuclide, different methods or literature about constant and the calculation of the TVL or recommended values were adopted to calculate and analyze the shielding thickness by lead as block material. Results The shielding thickness by the dose constant was calculated by point source model (0.142 μSv·m2·MBq-1·h-1) and TVL of lead recommended by NCRP was the biggest: at the control area the unit thickness for lead shield was 7.562×10-4 mm·MBq-1 for one patient. While by the dose constant recommended by AAPM TG108 (0.092 μSv·m2·MBq-1·h-1) and lead TVL recommended by IAEA was the minimum. The unit thickness for lead shield at the control area was 4.982×10-4 mm·MBq-1·patient-1, with difference of 36.2%. Conclusions The dose constant and the TVL value of lead from AAPM. TG 108 are recommended for the calculation. In shielding design attention should be paid to the distance protection, the separate toilet with shielding for patients, and the separate corridors beteen doctors and patients. |
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