Is it true, there are increasing levels of cancer causing Strontium-90 being found in "baby" teeth?

http://www.radiation.org/projects/tooth_...

historically Strontium-90 source came from above ground nuclear testing...are below ground test sites sealed?

where is it coming from...is it from nuclear reactors?..if so...then why is it allowed to happen?

if not...then where is it coming from?
Answer:
Every time some country in the entire world does a nuclear test of any kind, the nuclear byproducts are released into the air %26 travel the globe on the winds. It settles, we get it. It's transferred to babies through the mother, they get it before they're even born. Yes, it's from nuclear reactors as well as from nuclear testing. It's like with hot dogs - there's a "safe" level of nasty byproducts in them that you don't want to know about - well, there's a certain "safe" amount of nuclear leakage from reactors that is allowed as well. Not to mention the nuclear dump sites for spent rods %26 fuel from reactors. Yeah, it's buried, supposedly contained - but I'm willing to bet something leaks anyway. What's the answer? Stop all human reproduction? Stop any type of nuclear use globally? It's not possible - you can't put the genie back into the bottle once it's set free. And humans aren't going to stop having babies. So there is NO answer.not really...

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