When Radiation Causes Cancer?
These radiation may come from sources of radiation outside the body such as X-rays or gamma rays, leaks from nuclear reactors ... or from radioactive isotopes inserted into the body for treatment.
The effects of radiation exposure depend on the dose, the duration of infection (long or short term) and the organs involved.
In some cases of radiation exposure, body damage only occurs when the radiation dose exceeds a certain limit, usually a sievert (Sv) - (Sv is an international unit showing the absorbed dose causing Biological effects are similar to 1 gray (Gy) X-ray or gamma ray).
Examples include radiation-induced dermatitis, cataracts, organ dysfunction (which may appear only after many years), or radiation sickness (early reaction of very serious contamination)
In many other cases, the injury reappears when the body is re-exposed to radiation repeatedly.
As in cancer, for example, cancer occurs due to the mutation (changes in the genetic material of cells) caused by radiation.Radioactive leaks from nuclear reactors can increase mutations, leading to many cancers such as leukemia, birth defects in the next generation and genetic diseases. Cancer usually appears only after many years.
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