Not in a bad fifties sci-fi kind of way. More of a natural RNA mutation kind of way, only in an unexpected way? Say, if a bird flu bird from China flies over to Fukishima? We know that the natural progression of inter-species flu strains require, at some point, a mutation. Would a radioactive environment, such as the one around Fukishima, encourage flu strain mutations?
Disclaimer: IANAVirologist
The direct answer is yes - it is replicating DNA, radiation will cause mutations in that DNA …
but
the radiation induced mutations will be occurring at a level vastly lower than the replication mutations already occurring during normal viral activity.
This is always been the major problem (and humanities salvation, too) with influenza viruses - viral DNA replication is pretty rubbish, so the viral strains are constantly changing causing problems for our immune system. But it is also why a lethal strain occasionally pops up in the population (both avian and human). However, because the virus does not replicate reliably, lethal strains fairly quickly mutate into less-lethal strains. Variants of the 1918 Spanish Flu pandemic are still circulating, but with much lower lethality. It is only occasionally that you get the combination of human morbidity and transmission that defines a pandemic.
Si