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Polonium is a chemical element; it has symbol Po and atomic number 84. ... (5 curies) of 210 Po emits about as many alpha particles per second as 5 grams of 226 Ra ...
This is a list of prices of chemical elements.Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison.
Owing to its much shorter half-life, a milligram of 210 Po emits as many alpha particles per second as 5 grams of 226 Ra. [11] A few curies of 210 Po emit a blue glow caused by excitation of surrounding air. 210 Po occurs in minute amounts in nature, where it is the penultimate isotope in the uranium series decay chain.
It was originally defined as "the quantity or mass of radium emanation in equilibrium with one gram of radium (element)", [1] but is currently defined as 1 Ci = 3.7 × 10 10 decays per second [4] after more accurate measurements of the activity of 226 Ra (which has a specific activity of 3.66 × 10 10 Bq/g [5]).
The LD 50 is usually expressed as the mass of substance administered per unit mass of ... (suitable for botulinum), micrograms, or grams ... Polonium-210 (210 Po ...
The isotope produces 0.57 watts of thermal power per gram of 238 Pu. [5] The ESA's ExoMars Rosalind Franklin rover will use americium-241 RHUs. The half-life of Am-241 is five times that of 238 Pu, with a concomitant reduction in power-density. Soviet missions have used other isotopes, such as the polonium-210 heat source used in the Lunokhod ...
Radon-222 itself alpha decays to polonium-218 with a half-life of approximately 3.82 days, making it the most stable isotope of radon. [1] Its final decay product is stable lead-206. In theory, 222 Rn is capable of double beta decay to 222 Ra, and depending on the mass measurement, single beta decay to 222 Fr may also be allowed.
The abundance of elements in Earth's crust is shown in tabulated form with the estimated crustal abundance for each chemical element shown as mg/kg, or parts per million (ppm) by mass (10,000 ppm = 1%).