She selectively extracted uranium from ore samples to create purified uranium preparations and established a half-life for ionium.
3.
In 1911 Marckwald and Alexander Smith Russell published evidence suggesting that the radioactive thorium isotope 230 Th and ionium are identical.
4.
A related method is ionium-thorium dating, which measures the ratio of ionium ( thorium-230 ) to thorium-232 in ocean sediment.
5.
A related method is ionium-thorium dating, which measures the ratio of ionium ( thorium-230 ) to thorium-232 in ocean sediment.
6.
After she returned to work with Soddy in 1921, Hitchins further refined measurements of the half-life of ionium, and determined ratios of thorium isotopes in mineral samples.
7.
The ionium / thorium method of dating assumes that the proportion of thorium-230 to thorium-232 is a constant during the time period that the sediment layer was formed.
8.
In this scheme, 227 Th was named radioactinium ( RdAc ), 228 Th radiothorium ( RdTh ), 230 Th ionium ( Io ), 231 Th uranium Y ( UY ), 232 Th thorium ( Th ), and 234 Th uranium X1 ( UX 1 ).
9.
In this scheme, 227Th was named radioactinium ( RdAc ), 228Th radiothorium ( RdTh ), 230Th ionium ( Io ), 231Th uranium Y ( UY ), 232Th thorium ( Th ), and 234Th uranium X1 ( UX1 ) . [ 18 ] This reflects that 227Th and 231Th occur in the decay chain of natural 235U ( the actinium series ), 228Th occurs in the decay chain of 232Th ( the thorium series ), and that 230Th occurs in the decay chain of 238U ( the uranium or radium series ) . "-- think this belongs here, except needs to be re-written into a nice story : after you mention the first discovery of radioactivity, it generally makes sense to say something along the lines of " Research on radioactivity sparked like fire, and many new nuclides have been found that received their own names : . . . At one moment [ say when ], however, it became apparent that all of these were isotopes of the same element as the nuclide that was at that time referred to as " thorium " [ Th's only natural one, 232Th ].
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