發(fā)布時間：2018-11-05 20:35

【摘要】：通過對不同距離與屏蔽條件下腫瘤放射性粒子植入后患者的放射性檢測,實現(xiàn)輻射防護個體化與最優(yōu)化。隨機選擇35例北京大學(xué)深圳醫(yī)院微創(chuàng)介入病區(qū)并接受125I放射性粒子植入的患者,植入術(shù)后2h內(nèi)使用x-γ射線檢測儀在不同距離處檢測未屏蔽、0.25mmPb屏蔽、0.5mmPb屏蔽條件下患者的劑量當量率,采用統(tǒng)計軟件包SPSS19.0對結(jié)果進行t檢驗分析,并按照病區(qū)工作人員平均每人每日接觸患者2h計算相應(yīng)的年劑量當量。未屏蔽時,0.5m處工作人員所受的年劑量當量小于放射工作人員限值20mSv,2m處接近公眾限值1mSv,4m處相當于病室內(nèi)本底;在0.25mmPb屏蔽下,盡管零距離處35位患者的平均年劑量當量小于公眾限值,但其中有6位患者的年劑量當量大于公眾限值;在0.5mmPb屏蔽下,零距離處所有患者的年劑量當量已接近本底。結(jié)果表明,125I粒子植入后病區(qū)工作人員的工作時間、距離、屏蔽防護中,重點要做好個體化的屏蔽防護。0.25mmPb的鉛膠布是最常使用的屏蔽物,對于粒子植入數(shù)量較多或植入部位表淺的患者必要時也應(yīng)使用0.5mmPb的鉛膠布屏蔽,以實現(xiàn)輻射防護個體化和最優(yōu)化。
[Abstract]:In order to realize the individualization and optimization of radiation protection, the radioactivity of patients implanted with tumor radioactive particles at different distances and shielding conditions was detected. Thirty-five patients who received 125I radioactive seed implantation in the minimally invasive intervention area of Peking University Shenzhen Hospital were randomly selected. Within 2 hours after implantation, unshielded and 0.25mmPb shielding were performed at different distances by using x- 緯 -ray detector. Under the condition of 0.5mmPb shielding, the patient dose equivalent rate was analyzed by the statistical software package SPSS19.0, and the corresponding annual dose equivalent was calculated according to the average daily contact with the patient for 2 hours per worker in the ward. When unshielded, the annual dose equivalent at 0.5m was less than the radiation worker's limit of 20mSv-2m, which was close to the public limit of 1mSv-4m, which was equivalent to the background in the hospital room. Under 0.25mmPb shielding, although the average annual dose equivalent of 35 patients at zero distance was less than the public limit, six patients had annual dose equivalent greater than the public limit. Under 0.5mmPb shielding, the annual dose equivalent of all patients at zero distance is close to the background. The results showed that in the working time, distance and shielding protection of the workers in the ward after 125I seed implantation, the emphasis should be placed on the individualized shielding protection. The lead tape of 0.25mmPb is the most commonly used shield. In order to realize the individualization and optimization of radiation protection, 0.5mmPb lead blanket shield should also be used for the patients with a large number of particles or shallow implant sites.
【作者單位】： 北京大學(xué)深圳醫(yī)院核醫(yī)學(xué)科;北京大學(xué)深圳醫(yī)院微創(chuàng)介入科;
【基金】：深圳市科技計劃項目(201302066)
【分類號】：R730.55

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