krypton-85
Sign in to saveAlso known as Kr-85, 85Kr, krypton kr-85
Krypton-85 (85Kr) is a radioisotope of krypton, distributed throughout the atmosphere and presently forming about 15 ppt of atmospheric krypton on average.
Key facts
- Isotope.symbol
- Kr
- Isotope.mass_number
- 85
- Isotope.mass
- 84.9125273(21)
- Isotope.num_neutrons
- 49
- Isotope.num_protons
- 36
- Isotope.decay_product
- Rubidium
- Isotope.decay_symbol
- Rb
- Isotope.decay_mass
- 85
- Isotope.decay_mode1
- Beta decay
- Isotope.decay_energy1
- 0.687
- Isotope.decay_mode2
- Beta decay
- Isotope.decay_energy2
- 0.173
- Isotope.spin
- 9/2+
- Isotope.excess_energy
- −81480.267
- Isotope.binding_energy
- 8698.562
via Wikipedia infobox
Wikidata facts
- Mass
- 84.913
Show 10 more facts
- atomic number
- 36
- neutron number
- 49
- half-life
- 10.752
- spin quantum number
- 4.5
- parity quantum number
- 1
- mass excess
- -81480.331
- binding energy
- 739377.77
- canonical SMILES
- [Kr]
- chemical formula
- Kr
- isomeric SMILES
- [85Kr]
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Article
5 sectionsContents
- Presence in Earth's atmosphere
- Natural production
- Anthropogenic production
- Uses in industry
- References
Krypton-85 (85Kr) is a radioisotope of krypton, distributed throughout the atmosphere and presently forming about 15 ppt of atmospheric krypton on average.
Krypton-85 has a half-life of 10.728 years and a maximum decay energy of 687 keV. It decays into stable rubidium-85. Its most common decay (99.57%) is by beta particle emission with a maximum energy of 687 keV and an average energy of 251 keV. The second most common decay (0.43%) is by beta particle emission (maximum energy of 173 keV) followed by gamma ray emission (energy of 514 keV). Other decay modes have very small probabilities and emit less energetic gamma rays. Krypton-85 is mostly synthetic, though it is produced naturally in trace quantities by cosmic ray spallation.
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