New inhaled corticosteroids asthma

The presence of the isotope plutonium-240 in a sample limits its nuclear bomb potential, as plutonium-240 has a relatively high spontaneous fission rate (~440 fissions per second per gram—over 1,000 neutrons per second per gram), [15] raising the background neutron levels and thus increasing the risk of predetonation . [16] Plutonium is identified as either weapons-grade , fuel-grade, or reactor-grade based on the percentage of plutonium-240 that it contains. Weapons-grade plutonium contains less than 7% plutonium-240. Fuel-grade plutonium contains from 7% to less than 19%, and power reactor-grade contains 19% or more plutonium-240. Supergrade plutonium , with less than 4% of plutonium-240, is used in . Navy weapons stored in proximity to ship and submarine crews, due to its lower radioactivity. [17] The isotope plutonium-238 is not fissile but can undergo nuclear fission easily with fast neutrons as well as alpha decay. [4]

New inhaled corticosteroids asthma

new inhaled corticosteroids asthma

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