horodao now wrote:

Is it safe to travel to Tokyo?
How far can the radiation reach - 100km?

If you're paranoid about radiation then air travel isn't for you.

Your message is too cryptic for me. What do you mean by that?

He means that statistically speaking, your comparing two equally
unlikely events (being injured by radiation, being injured in a plane
crash).

Or to look at this another way -

Air travel itself has some inherent risk. So it's kind of stupid to ask
if it's risky being in Tokyo due to radiation when you have to endure a
different sort of risk just to fly there.