Following up this article http://fukushima-diary.com/2011/12/escape-plan-12152011/
It’s been believed that radiation damages your DNA to cause cancer, the end.
Nerves or brains are therefore insensitive to radiation.
They even made up the word, “radio-phobia”.
Most of the people died in Chernobyl because they believed radiation would potentially cause them cancer, they got paranoid so they killed themselves. As a conclusion, if you are smiling, you would never be affected by radiation.
Dr.Yamashita Shunichi, the radiation hazard advisor of Fukushima said he even proved it with “animal study”.
Some people saw him wearing a mask recently, but anyway, the theory is already denied by at least one post-Chernobyl study.
Here is the part about the risk of organic damage to your nerve.