Before coming to our country many foreigners (volunteers, tourists) read about weather, climate, sightseeing, culture and etc.
It is not a secret.. there is high radioactivity at some regions of our country. Foreigners know about it and feel scared because of it.
My idea is a kind of trick.. well, it is ok.. it will help you to make money.
So, I suggest you a great deal.. I suggest to sell umbrellas against radioactivity.. yeah, I didn't misspell.. umbrellas against radioactivity.
All you need is just to buy some usual cheap umbrellas. Then on umbrella paint the sign of radioactivity in yellow and cross it with black line. You can print an instruction for these umbrellas. In instruction you can write that an umbrella will protect you from radioactive rain for 36 hours. You can sell them at airports, near travel agencies and etc. They will cost more than a usual umbrella.