Assertion: protactinium's isotope | /r/HasProperty | 231pa
Facets:
Source sentences:
text: Discovery of the element is attributed to Otto Hahn and Lise Meitner, who discovered another isotope of protactinium, 231Pa in 1917.
text: In 1917 the German physicist Lise Meitner isolated a more stable isotope of the element, 231Pa with a vastly longer half-life of about 33,000 years.
text: In the very same year, the same isotope, 231Pa, was independently isolated by Frederick Soddy, who had first coined the term isotope, and his colleague John Cranston when they were working together in Glasgow.
text: A more stable isotope of protactinium, 231Pa, was discovered in 1917/18 by Otto Hahn and Lise Meitner, and they chose the name proto-actinium, but the IUPAC finally named it "protactinium" in 1949 and confirmed Hahn and Meitner as discoverers.
text: In 1917/18, two groups of scientists, Otto Hahn and Lise Meitner of Germany and Frederick Soddy and John Cranston of Great Britain, independently discovered another isotope of protactinium, 231Pa, having a much longer half-life of about 32,000 years.
text: The primary decay mode for the most stable isotope 231Pa and lighter (i.e. 212Pa to 231Pa) is alpha decay, producing isotopes of actinium.
text: Its major isotope 231Pa has a specific activity of 0.048 curies (1.8 GBq) per gram and primarily emits alpha-particles with an energy of 5 MeV, which can be stopped by a thin layer of any material.
text: The only naturally occurring isotopes are 231Pa, which occurs as an intermediate decay product of 235U, 234Pa and 234mPa, both of which occur as intermediate decay products of 238U. 231Pa makes up nearly all natural protactinium.
text: Its longest lived isotopes are 231Pa, with a half-life of 32,760 years, 233Pa with a half-life of 26.967 days and 230Pa with a half-life of 17.4 days.
text: The standard atomic weight of protactinium is determined solely by its isotope 231Pa.
text: The only terrestrial source of Pa is by radioactive decay of heavier elements, almost entirely from uranium, the ores of which contain the two isotopes 231Pa and 234Pa in equilibrium proportions.
text: In 1918, two groups of scientists, led by Otto Hahn and Lise Meitner of Germany and Frederick Soddy and John Cranston of Great Britain, independently discovered another isotope of protactinium, 231Pa having much longer half-life of about 32,000 years.
text: Its major isotope 231Pa has a specific activity of 0.048 Ci/gram and primarily emits alpha-particles of the energy 5 MeV, which can be stopped by a thin layer of any material.
text: In 1917 the German physicist Lise Meitner isolated a more stable isotope of the element, 231Pa with a vastly longer half-life of about 33,000 years.
text: In the very same year, the same isotope, 231Pa, was independently isolated by Frederick Soddy, who had first coined the term isotope, and his colleague John Cranston when they were working together in Glasgow.
text: The most important natural isotope is 231Pa, but the industrial importance of Pa stems chiefly from the role of its artificial isotope, 233Pa, as an intermediate in the production of fissile 233U in thorium breeder reactors.
text: ; its most long-lived isotope, 231Pa, has a half-life of 32,500 years.
text: A more stable isotope (231Pa) of protactinium was discovered in 1917/18 by Otto Hahn and Lise Meitner, and they chose the name proto-actinium, but then the IUPAC named it finally protactinium in 1949 and confirmed Hahn and Meitner as discoverers.
text: In 1917/18, two groups of scientists, Otto Hahn and Lise Meitner of Germany and Frederick Soddy and John Cranston of Great Britain, independently discovered another isotope of protactinium, 231Pa having much longer half-life of about 32,000 years.
text: Its major isotope 231Pa has a specific activity of 0.048 Ci/gram and primarily emits alpha-particles of the energy 5 MeV, which can be stopped by a thin layer of any material.
text: Protactinium is an actinide (Z=91; atomic mass 231.0359); it name derives from protos (Greek for first) and actinium, because it most abundant isotope (231Pa) is parental to 227Ac.
text: In March of 1918, Lise Meitner and the conscripted Otto Hahn beat Soddy in the hunt for eka-tantalum and discovered the isotope 231Pa, code-named “abrakadabra” in their correspondence, which indeed converted into actinium through alpha decay.
text: There are twenty-four known isotopes of Pa, having mass numbers ranging from 214 to 238, the most stable isotope being 231Pa.
text: Discovery of the element is attributed to Otto Hahn and Lise Meitner, who discovered another isotope of protactinium, 231Pa in 1917.