What happens to the radium when people use their radium for radon? Does the radium that was used gets transferred to those that mine a block?
yes, that is exactly what happens!
Whenever someone turns Radium into Radon, the Radium goes to supplement the block reward of the next block. Basically this means, that as more people start using the SmartChain, the more profitable staking will become.
JJ
Indeed, not many people know this and I think even less people realise how great this is.
The more traction Radium gains, the more profitable it will be to just stake your coins (and it's already pretty profitable).
Yes it is. Radium is a great investment.