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| General | |
|---|---|
| Symbol | 85Kr |
| Names | krypton-85, 85Kr, Kr-85 |
| Protons (Z) | 36 |
| Neutrons (N) | 49 |
| Nuclide data | |
| Half-life (t1/2) | 10.756 years |
| Isotope mass | 84.9125273(21) Da |
| Spin | 9/2+ |
| Excess energy | −81480.267 keV |
| Binding energy | 8698.562 keV |
| Decay products | 85Rb |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| Beta decay | 0.687 |
| Beta decay | 0.173 |
| Isotopes of krypton Complete table of nuclides | |
Krypton-85 (85Kr) is a radioisotope of krypton.
Krypton-85 has a half-life of 10.756 years and a maximum decay energy of 687 keV.[1] It decays into stable rubidium-85. Its most common decay (99.57%) is by beta particle emission with 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).[2] Other decay modes have very small probabilities and emit less energetic gamma rays.[1][3] Krypton-85 is mostly synthetic, though it is produced naturally in trace quantities by cosmic ray spallation.
In terms of radiotoxicity, 440 Bq of 85Kr is equivalent to 1 Bq of radon-222, without considering the rest of the radon decay chain.
- ^ a b "WWW Table of Radioactive Isotopes - Kr85". Lawrence Berkeley Laboratories, USA. Archived from the original on 2015-06-11. Retrieved 2015-05-30.
- ^ M. Gorden; et al. (15 July 2011). "Pinellas Plant – Occupational Environmental Dose rev1" (PDF). ORAU. Retrieved 2015-05-30.
- ^ H. Sievers (1991). "Nuclear data sheets update for A=85". Nuclear Data Sheets. 62: 271–325. Bibcode:1991NDS....62..271S. doi:10.1016/0090-3752(91)80016-Y.
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