So long as it is a choice by free adults, who have a real option to decline, its what the mkt. will bear.
And I think we will find out that there are many markets for one's life depending on their social economic status.. People who has trouble making end's meet will value their life a lot less than people who make a lot of money today.. there will be a lot of "volunteers" from poorer countries like Phillipines, Vientnam, Cambodia, and part of China..
When it is forced upon one unwilling, like the land owners, evacuees, or anyone who has had to deal with either personally, or in their business, from fallout in food, water or air, then it is more akin to a use of eminent domain.
Isn't eminent domain an issue of the right of individual vs the right of the society? I think we are seeing the effect of not having the nuclear power plant in Tokyo.. they are talking about rotating black out through the summer and beyond... I don't know where the line should be drawn but there is clearly a line where the right of society override the right of individual (e.g. an easement allowing fire truck to pass through a particular piece of land so that it can reach the neighbor in case of fire).. And that line is influence by culture, historic value and the economic and social backdrop of a country.