中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2013年
6期
658-661
,共4页
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
正電子%屏蔽計算%18F%十分之一衰減厚度%正電子髮射斷層攝影
정전자%병폐계산%18F%십분지일쇠감후도%정전자발사단층섭영
Positron%Radiation protection calculating%18F%Tenth-value layers%PET
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,1h的受药时间、1h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AAPMTG108推荐的剂量常数(0.092μSv·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.
目的 探討正電子湮滅產生γ光子的輻射防護最佳屏蔽計算方法.方法 以18F為典型覈素,分彆採用不同方法或文獻關于劑量常數及十分之一衰減厚度(TVL)的計算或推薦值,以鉛為屏蔽材料進行計算分析.結果 以1週40箇患者、每箇患者給藥555 MBq,1h的受藥時間、1h的候診時間的情況為例,採用點源模型計算的劑量常數(0.142 μSv· m2· MBq-1·h-1)及NCRP推薦的鉛的TVL值計算的屏蔽厚度最大,控製區單位鉛屏蔽厚度為7.562×10-4mm· MBq-1;採用AAPMTG108推薦的劑量常數(0.092μSv·m2 ·MBq-1·h-1)及IAEA推薦的鉛的TVL值計算結果最小,單位鉛屏蔽厚度為4.982×10-4mm· MBq-1.兩者相差33.2％.結論 推薦採用AAPM TG 108工作組推薦的劑量常數及鉛的TVL進行屏蔽計算.屏蔽規劃設計時應充分攷慮距離防護,設立患者衛生間,攷慮醫患分流.
목적 탐토정전자인멸산생γ광자적복사방호최가병폐계산방법.방법 이18F위전형핵소,분별채용불동방법혹문헌관우제량상수급십분지일쇠감후도(TVL)적계산혹추천치,이연위병폐재료진행계산분석.결과 이1주40개환자、매개환자급약555 MBq,1h적수약시간、1h적후진시간적정황위례,채용점원모형계산적제량상수(0.142 μSv· m2· MBq-1·h-1)급NCRP추천적연적TVL치계산적병폐후도최대,공제구단위연병폐후도위7.562×10-4mm· MBq-1;채용AAPMTG108추천적제량상수(0.092μSv·m2 ·MBq-1·h-1)급IAEA추천적연적TVL치계산결과최소,단위연병폐후도위4.982×10-4mm· MBq-1.량자상차33.2％.결론 추천채용AAPM TG 108공작조추천적제량상수급연적TVL진행병폐계산.병폐규화설계시응충분고필거리방호,설립환자위생간,고필의환분류.
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.
