A metallic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red. Symbol Sr. Atomic weight 87.3.
A radioactive isotope of strontium produced by certain nuclear reactions, and constituting one of the prominent harmful components of radioactive fallout from nuclear explosions; also called radiostrontium. It has a half-life of 28 years.
primarily participates in bone metabolism and tends to compete with Vitamin D and calcium, which it closely resembles, for utilization and absorption purposes. There are no known symptoms of strontium toxicity or deficiency in humans. Strontium is poorly absorbed from the diet and plasma concentration is very low. Sources of strontium are usually found in water, dairy products, and fruits and vegetables.