The greatest danger to humans is from artificial isotopes 89Sr and 90Sr produced in nuclear reactions; fallout of 90 Sr mainly from atmospheric nuclear explosions (and power-plant reactor accidents) has caused great concern. These isotopes are deposited in bones, acting as a source of internal radiation. The 90 Sr has a half-life of 28 years and emits beta particles that damage the blood forming cells in the bone marrow.
Obviously, as can be seen, this is not the case of strontium carbonate.
Strontium Carbonate Hazars at ilo.org
Article by Edouard Bastarache
Edouard Bastarache is a well known doctor that has written many articles on the subject of toxicity of ceramic materials and books on technical aspects of ceramics. He writes in both English and French.
By Edouard Bastarache