krypton-85 decays by emission of a beta particle. the product of this decay is
rubidium-85
title: Krypton-85 text: Krypton-85 Krypton-85 (Kr) is a radioisotope of krypton. It has a half-life of 10.756 years and a maximum decay energy of 687 keV. It decays into stable, non-radioactive 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). Other decay modes have very small probabilities and emit less energetic gammas. It's one of the 33 known isotopes of krypton. In terms title: Krypton-85 text: type 5651. Krypton-85 Krypton-85 (Kr) is a radioisotope of krypton. It has a half-life of 10.756 years and a maximum decay energy of 687 keV. It decays into stable, non-radioactive 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). Other decay modes have very small probabilities and emit less energetic gammas. It's one of the 33 known isotopes of krypton. title: Krypton-85 text: krypton-85 released from reprocessing activity has been estimated as 10,600 PBq as of 2000. The global inventory noted above is smaller than this amount due to radioactive decay; a smaller fraction is dissolved into the deep oceans. Other man-made sources are small contributors to the total. Atmospheric nuclear weapons tests released an estimated 111-185 PBq. The 1979 accident at the Three Mile Island nuclear power plant released about 1.6 PBq (43 kCi). The Chernobyl accident released about 35 PBq, and the Fukushima Daiichi accident released an estimated 44-84 PBq. The average atmospheric concentration of krypton-85 was approximately 0.6 Bq/m in title: Strontium-90 text: Y, which in turn undergoes β decay with half-life of 64 hours and decay energy 2.28 MeV distributed to an electron, an anti-neutrino, and Zr (zirconium), which is stable. Note that Sr/Y is almost a pure beta particle source; the gamma photon emission from the decay of Y is so infrequent that it can normally be ignored. Sr has a specific activity of 5.21 TBq/g. Sr is a product of nuclear fission. It is present in significant amount in spent nuclear fuel and in radioactive waste from nuclear reactors and in nuclear fallout from nuclear tests. For thermal neutron fission title: Alpha decay text: 106–110) of tellurium (element 52). Exceptionally, however, beryllium-8 decays to two alpha particles. Alpha decay is by far the most common form of cluster decay, where the parent atom ejects a defined daughter collection of nucleons, leaving another defined product behind. It is the most common form because of the combined extremely high binding energy and relatively small mass of the alpha particle. Like other cluster decays, alpha decay is fundamentally a quantum tunneling process. Unlike beta decay, it is governed by the interplay between both the nuclear force and the electromagnetic force. Alpha particles have a typical kinetic energy