<prompt> WHICH IS TRUE REGARDING STRONTIUM 89 WHEN COMPARED TO PHOSPHOROUS 32 ?STR 89 HAS SHO T12STR 89 HAS LESS TOXICITYSTR 89 HAS DEEPER PENETRATIONNONE OF THE ABOVE  <response>: Strontium 89METASTRON Calcium analogue Pure beta radiation emitter Incorporated into the bone matrix directly in areas of active bone remodelling Biological half-life of Sr89 isotope - 50.5 days. Administered IV as strontium chloride Main means of isotope elimination- kidneys Used in metastatic prostate and breast cancer ref : david sutton 9th ed 