Calcium Phosphate

**Semantic type:** Indicator, Reagent, or Diagnostic Aid|Organic Chemical

**Definition:** The calcium salt of phosphoric acid with widely used applications. This agent can be used as a countermeasure for exposure to strontium and radium radionuclides. Upon oral uptake, calcium phosphate competes for and blocks the absorption of radium (Ra-226) and strontium (Sr-90) in the gastrointestinal (GI) tract.

**Synonyms:** - CALCIUM PHOSPHATE, UNSPECIFIED FORM - Phosphoric Acid, Calcium Salt