外照射是核辐照射的一种方式。放射性核素在生物体外，使生物受到来自外部的射线照射称为外照射。
外照射（external irradiation）： 辐射源从体外对机体进行的照射。γ 射线、中子、 X射线等穿透力强，外照射的生物学效应强。
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... external fire exposure 外部暴露于火 external radiation exposure 外照射 External fire exposure to roofs 屋顶外部防火 ...
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外照射指数 external exposure index
红外照射距离 IR View Distance ; Infrared effective range ; IR LED
外照射量 external exposure
外照射剂量 external dose ; external irradiation dose
紫外照射 UV irradiation ; uv bestrahlung ; ultraviolet irradiation ; ultra-vioket radiation
体外照射 external irradiation ; Teletherapy ; ECI Extracorporeal Irradiation
个人外照射监测器 personal external exposure monitor
外照射放疗 EBRT ; External beam radiation therapy ; External Beam Irradiation
外照射治疗 External radiot herapy ; external beam radiotherapy ; external radiation treatment
Radiotherpy is an effective treatment of liver cancer,but its appllication is limited because cure dosage of external irradiation is very higher than tolerance dosage of nomal liver.
放射治疗是肝癌的一种有效方法,但一般外照射的根治剂量远高于正常肝脏的耐受剂量,应用明显受到限制。
参考来源 - 碘MethodsAnalysis was made on the monitoring data of external exposure dose of medical staff of 145 medical clinics and health institutions were in Taiyuan city during 2002-2008.
方法对2002～2008年太原市145家医疗卫生机构的放射诊疗工作人员个人外照射剂量监测资料进行分析。
参考来源 - 2002～2008年太原市放射诊疗工作人员个人剂量监测结果分析Up to present, radiotherapy has been focused on external beam radiation, and externally applied radiation is prejudicial for sensitive components from normal cells.
目前,临床肿瘤放射治疗主要采用外照射放射治疗,但其会在射线杀伤肿瘤细胞的同时损伤周围正常细胞。
参考来源 - ~（18）氟—氟代脱氧葡萄糖诱导Lewis肺癌细胞凋亡的实验研究Conclusions:External beam irradiation(~(60)Co)could prevent restenosis effectively and safely in definite dose scope,and effects was related to the delivered dose. Inducing VSMC apoptosis may contribute to the preventing of restenosis,and the dose-effectiveness relation was also observed.
结论:~(60)Co外照射在一定的靶血管壁吸收剂量范围内可安全有效的防止血管成形术后再狭窄的形成,并且随剂量呈递增效应;促进血管平滑肌细胞凋亡可能是其作用机制之一,亦存在量效关系。
参考来源 - γ射线外照射预防兔股动脉再狭窄及其对细胞凋亡的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
职业外照射剂量，采用TLD剂量计测得。
介绍了外照射源目标探测的作用和研究的必要性。
The feature of passive detection and the necessity to research it are described first.
因此该区属于外照射水平的安全区域，人居环境不受影响。
So Qingdao is safe in radiological level and the dwelling environment is not affected.
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