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Naturally occurring strontium is nonradioactive and nontoxic at levels normally found in the environment, but 90 Sr is a radiation hazard. [4] 90 Sr undergoes β − decay with a half-life of 28.79 years and a decay energy of 0.546 MeV distributed to an electron, an antineutrino, and the yttrium isotope 90 Y, which in turn undergoes β − decay with a half-life of 64 hours and a decay energy ...
A beta emitter such as technetium-99 or strontium-90 is suspended in a gas or liquid containing luminescent gas molecules of the excimer type, constituting a "dust plasma". This permits a nearly lossless emission of beta electrons from the emitting dust particles.
Strontium-90 has been used by the Soviet Union in terrestrial RTGs. 90 Sr decays by β − decay into 90 Y, which quickly decays again via β emission. It has a lower decay energy than 238 Pu, but its shorter half life of 28.8 years and lower atomic weight yield a power density for pure metal of 0.95 watts per gram. [42] As 90
Plutonium-238 must be deliberately produced via neutron irradiation of Neptunium-237 but it can be easily converted into a stable plutonium oxide ceramic. Strontium-90 is easily extracted from spent nuclear fuel but must be converted into the perovskite form strontium titanate to reduce its chemical mobility, cutting power density in half ...
The generator contains the strontium-90 radioisotope, with a heating power of 250W and 1,480 TBq of radioactivity – equivalent to some 280 grams (9.9 oz) of Sr-90. [4] Mass-scale production of RTGs in the Soviet Union was the responsibility of a plant called Baltiyets, in Narva , Estonia .
The system did not have a power conversion but used a secondary heat air blast system to dissipate the heat to the atmosphere. The SER used a similar reactor reflector moderator device as the SNAP-10A but with only one reflector. Criticality was achieved in September 1959 with final shutdown completed in December 1961.
Strontium-90 is a commonly used beta emitter used in industrial sources. It decays to yttrium-90, which is itself a beta emitter. It is also used as a thermal power source in radioisotope thermoelectric generator (RTG) power packs. These use heat produced by radioactive decay of strontium-90 to generate heat, which can be converted to ...
Strontium-90: 38: 52: 28.8 y: β −: 546 Fission product: medium-lived fission product; probably most dangerous component of nuclear fallout Technetium-99: 43: 56: 210,000 y: β −: 294 Fission product: most common isotope of the lightest unstable element, most significant of long-lived fission products: Technetium-99m: 43: 56: 6 hr: γ,IC ...