普通的宇宙射线微不足道。
人们发现普通的消毒手段不能彻底消除细菌和微生物，射线是解决这个问题最好的办法。
People found the normal method of sterility can not destroy some of virus and germ thoroughly, and radiation sterility is the best way to solve this problem.
地塞米松扫描测量中钙含量的骨头-这可以不进行评估，在一个普通的X射线。
DEXA scans measure the calcium content in the bones - this cannot be evaluated in an ordinary X-ray.
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