Nature, Količina 108Sir Norman Lockyer Macmillan Journals Limited, 1921 |
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Zadetki 1–3 od 87
Stran 217
... lead and helium which they now contain . The order and rate of radio- active disintegration through the series from uranium to lead are known with considerable pre- cision ; helium also is evolved at a definite ascer- tained rate . An ...
... lead and helium which they now contain . The order and rate of radio- active disintegration through the series from uranium to lead are known with considerable pre- cision ; helium also is evolved at a definite ascer- tained rate . An ...
Stran 280
... lead - that is , an element chemically indistinguishable from lead , except by a slight difference of atomic weight and ( practically at least ) inseparable from ordinary lead by chemical means if once mixed with it . The isotope of lead ...
... lead - that is , an element chemically indistinguishable from lead , except by a slight difference of atomic weight and ( practically at least ) inseparable from ordinary lead by chemical means if once mixed with it . The isotope of lead ...
Stran 281
... lead in this mineral has an atomic weight of 206.06 as determined by Hönigschmied and Fräulein St. Horovitz . The ratio of lead to uranium is 1 : 3 . Taking the lead as all produced by uranium at the rate above given , we get an age of ...
... lead in this mineral has an atomic weight of 206.06 as determined by Hönigschmied and Fräulein St. Horovitz . The ratio of lead to uranium is 1 : 3 . Taking the lead as all produced by uranium at the rate above given , we get an age of ...
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