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Naturally occurring chromium (24Cr) is composed of four stable isotopes; 50Cr, 52Cr, 53Cr, and 54Cr with 52Cr being the most abundant (83.789% natural abundance). 50Cr is suspected of decaying by β+β+ to 50Ti with a half-life of (more than) 1.8×1017 years. Twenty-two radioisotopes, all of which are entirely synthetic, have been characterized with the most stable being 51Cr with a half-life of 27.7 days. All of the remaining radioactive isotopes have half-lives that are less than 24 hours.

Chromium-51 is a manmade isotope of chromium used in medicine as a radioisotopic tracer.

Spectrum (Fullscreen)

10 minute measurement with a High Purity Germanium (HPGe) radiation detector.

Metadata

Isotope: Chromium
Mass number: 51
Atomic number: 24
Neutron number: 27

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