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231 Pa makes up nearly all natural protactinium. The primary decay mode for isotopes of Pa lighter than (and including) the most stable isotope 231 Pa is alpha decay, except for 228 Pa to 230 Pa, which primarily decay by electron capture to isotopes of thorium. The primary mode for the heavier isotopes is beta minus (β −) decay.
Much smaller trace amounts of the short-lived protactinium-234 and its nuclear isomer protactinium-234m occur in the decay chain of uranium-238. Protactinium-233 occurs as a result of the decay of thorium-233 as part of the chain of events necessary to produce uranium-233 by neutron irradiation of thorium-232.
The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [note 1] including notable elements such as uranium and plutonium.The nuclides (or isotopes) thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and (in the case of neptunium ...
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[36] [38] The specific degrees of inhibition after 4 weeks were 99.4% with 10 mg/day, 99.5% with 5 mg/day, 96.0% with 10 mg twice per week, and 75.9% with 10 mg once per week, respectively. [38] On the basis of these findings, it was concluded that 20 mg per week (as 10 mg twice per week) is the minimum dosage that can produce maximal and long ...
The most common side effects reported during clinical trials in men receiving 223 Ra were nausea, diarrhea, vomiting and swelling of the leg, ankle or foot. The most common abnormalities detected during blood testing were anemia , lymphocytopenia , leukopenia , thrombocytopenia and neutropenia .
Protactinium(V) fluoride can be prepared by reacting protactinium oxide with either bromine pentafluoride or bromine trifluoride at about 600 °C, and protactinium(IV) fluoride is obtained from the oxide and a mixture of hydrogen and hydrogen fluoride at 600 °C; a large excess of hydrogen is required to remove atmospheric oxygen leaks into the ...
Over the last 25 years, (ED) medications such as Viagra and others have become common and normal pieces of bedroom tool kit. These little pills have helped hundreds of millions of men all over the ...