After 373 days half of that Ruthenium-106 will be gone Ru106 (l373 days)->Rh106 (29s)->Pd106 What concerns me are the other Uranium daughter particles that don't show up on beta ray detectors.
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According to EU (euratom) law, all member states measure all radiation types on a continuous basis. Apart from the normal and natural radioactive substances like beryllium-7 and lead-210, ONLY ruthenium-106 was found.
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That means somebody is burning a halide. The oxides of Ru are all solids. Organometallic compounds of Ru aren't easy to produce, but are the only highly toxic forms I can think of. The metal is fairly inert. You have to try to spread it - try hard. Sabotage?
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It is thought that 100 to 300 Terabequerels of activity has been released. If pure metal, we’re talking 1 or 2 grammes here. At this moment, the exact location or the discharge scenario are still unknown.
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If it is unprocessed fuel waste burning then there should be a measurable quantity of Rh-106 detected via higher energy beta rays. Without Rh-106, then somebody is burning Ru-106 hexafluoride.
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Could also be an RTG (radioisotope thermoelectric generator).
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I was thinking that at first and I beleive you are on the right track except for the missing RH-106 signature. Paired Ruthenium and Rhodium are trademarks of RTGs. While the Rh-106 is long gone by the time of sensing, the gamma spectra is evident. I'd have to see the data.
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Not sure I understand you correctly? Ruthenium-106 emits low energy beta radiation which is hard to measure. The daughter isotope, rhodium-106, which always is present too, emits some easy-to-measure gamma’s.
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