» Sodium Chromate Cr 51 Injection is a sterile solution of radioactive chromium (⁵¹Cr) processed in the form of sodium chromate in Water for Injection. For those uses where an isotonic solution is required, Sodium Chloride may be added in appropriate amounts as provided under Injections and Implanted Drug Products 〈1〉 . Chromium 51 is produced by the neutron bombardment of enriched chromium 50.