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4 giorni fa · This is a list of radioactive nuclides (sometimes also called isotopes ), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds. [1] 10−24 seconds (yoctoseconds)
1 giorno fa · In the context of nuclear waste management, the most important isotopes of yttrium are 91 Y and 90 Y, with half-lives of 58.51 days and 64 hours, respectively. Though 90 Y has a short half-life, it exists in secular equilibrium with its long-lived parent isotope, strontium-90 (90 Sr) with a half-life of 29 years.
- silvery white
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4 giorni fa · Many of the processes designed to remove fission products in reprocessing plants aim at cationic species such as caesium (e.g., caesium-137) and strontium (e.g., strontium-90). Hence the pertechnetate escapes through those processes. Current disposal options favor burial in continental, geologically stable rock.
2 giorni fa · What I didn’t know then – but learned about 20 years later – was experiments on dairy cattle at the time showed that radioactive Iodine-131, and possibly Strontium-90, had entered the food chain and thus into the milk that was being force-fed to Australian schoolchildren.
2 giorni fa · The AEC (Atomic Energy Commission) ejected between 6.3 billion and 17 billion and other surrounding regions with various radioactive contamination over a twelve year period, this inundated the region and other surrounding regions with various radioactive isotopes such as Cerium-140, Iodinne-131, Xenon-131, Strontium-90, Yittrium-90, Cesium-137, Barium-137, Potassium-40, Argon-40, Magnesium-24 ...
4 giorni fa · Materials. Abstract: The investigation of variations within the non-traditional stable Sr isotope composition in various natural systems has gained a broader interest in recent years. Although significant improvements in the analytical precision for isotopic ratio analysis have been made, the accurate determination of stable Sr isotopic ratios ...
1 giorno fa · The quarter-wave section of a transmission line providing a phase shift of 90° can be replaced with a low-pass filter (LPF) on lumped elements L and C. Using a controlled ferroelectric capacitor as C and applying a constant bias voltage to it, we can change the parameters of the transmission line, especially the phase speed and characteristic impedance.
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