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Due to the short half-life of all its isotopes, its natural occurrence is limited to tiny traces of the fleeting polonium-210 (with a half-life of 138 days) in uranium ores, as it is the penultimate daughter of natural uranium-238. Though two longer-lived isotopes exist (polonium-209 with a half-life of 124 years and polonium-208 with a half ...
Polonium-210 has a half-life of 138 days and decays to the stable daughter isotope of lead, 206 Pb. Therefore, the source is reduced to about one sixteenth of its original radioactivity about 18 months after production. By measuring the proportion of polonium and lead in a sample, one can establish the production date of polonium.
Dozens of captive animal species have been found infected or proven able to be experimentally infected with SARS-CoV-2, the virus that causes COVID-19. The virus has also been found in over a dozen wild animal species. Most animal species that can get the virus have not been proven to be able to spread it back to humans.
The new "FLiRT" COVID-19 variants, including KP.3 and KP.2, are spreading in the United States. Will there be a summer surge? Experts discuss transmission, symptoms, and vaccines.
Health Feedback, fact-check, "COVID-19 is more deadly and more contagious than seasonal flu and may also cause long-lasting damage to survivors," Oct. 20, 2020. Accessed Jan. 18, 2022.
SARS-CoV-2, the causative agent of COVID-19, was first introduced to humans through zoonosis (transmission of a pathogen to a human from an animal), and a zoonotic spillover event is the origin of SARS-CoV-2 that is considered most plausible by the scientific community.
In March 2020 the Food and Drug Administration (FDA) issued an emergency use authorization allowing hydroxychloroquine and chloroquine to be used to treat certain severely ill Covid-19 patients.
The decay chain of uranium-238, known as the uranium series or radium series, of which polonium-210 is a member Schematic of the final steps of the s-process.The red path represents the sequence of neutron captures; blue and cyan arrows represent beta decay, and the green arrow represents the alpha decay of 210 Po.