Increased rates of cancer also have been detected in people
exposed to high-strength forms of radiation such as X-rays or
radiation emitted from radioisotopes. Because these two types of
radiation are stronger than ultraviolet radiation, they can penetrate
through clothing and skin and into the body. Therefore,
high-strength radiation can cause cancers of internal body tissues.
The cancer-causing ability of high-strength radiation has been
shown in several instances. Examples include cancer caused by
nuclear fallout from atomic explosions and cancers caused by
excessive exposure to radioactive chemicals.