''I don't care what all of you macho buffoons say but there is no safe exposure to radiation, period.''
Actually, scientists are now suggesting that a little bit of radiation is good for you. It kills off the viable mutated cells which can develope into cancers. Statistics show a lower cancer rate amongst employees who work with low level radiaiton evices such as airport x-ray machines. A good analogy is the areas of the UK which have elevated levels of naturally occuring radon gas. The rates of all types of cancer are lower in these areas. But the rates of lung cancer - which has exposure to radon as a prime factor - are up.
Radon is created when uranium decays. The areas of the UK where radon is present in high concentrations tend to have granite as a bed rock where naturally formed uranium deposits are common.
What's Hong Kong built on? It's granite! And what's more - granite is used as an aggregate in concrete in most buildings here. Studies were done in the 1990s as to the levels of radon in Hong Kong buidings and I suggest that if you're easily worried about radiation - you don't google 'Radon gas in Hong Kong'.