It has already turned out that radiation has a certain influence on a human body immediately after discovering radiation by W. K. Roentgen in 1895. The medical treatment started just after discovery of radiation, and in the present time the medical treatment, diagnosis and inspection are greatly used and have become an indispensable means in the medical field. On the other hand, the injury has already appeared immediately after discovery of radiation and it has been reported that the doctor who treated X-rays died by the radiation injury at the beginning of 1900s. Thus, benefits and risks exist simultaneously as for use of radiation and it can be called the light and the shadow of radiation. In this paper, probability of cancer by radiation in use is described in the use in diagnosis and inspection except medical tre'atment, attendance, and for the purpose of medicine research. First, it is shown in Table 1 that there is actually how much frequency exposed by diagnostic X-ray and inspection in Japan. Now, on 10 February 2004, two famous newspapers in Japan, The Yomiuri -shinbun and The Asahi-shinbun, reported about the probability of cancer risk in medical exposure by quoting a paper published in Lancet. The outline of presumption of cancer frequency was as follows.
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