Just following on from Kamikaze's post .. Radiation poisoning is actually an oxymoron as he goes on to explain, to add to his post and the points he made - when our bodies cells divide and multiply they do so with an inbuilt timer for there own demise IE a death switch, this ensures the coded sequence is kept as good as it can be and genetic errors in the dividing are not continuously repeated - radiation is a double whammy as it can damage the genetic code and also switch off the natural kill switch of cells which leads to many annoying or life threatening issues.
Cancer is just that and is caused by several factors from the solar radiation (skin cancer often a result), environmental factors, chemical/toxin exposure through to good old genetic flaws passed down to you.
Many people see cancer as some form of disease they catch but it is more so there own bodies genetic code been damaged and replicating the damage until it is either stopped or leads to ones demise.