isotopicallyadv.
/ʌɪsəˈtɒpɪkəli/ a. As regards isotopes or isotopic constitution.
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the world > matter > chemistry > elements and compounds > isotopes > [adverb]
isotopically1933
1933 in N.E.D. Suppl. at Isotope
1940 Jrnl. Biol. Chem. 133 737 A deuteropalmitic acid is added to a mixture of isotopically normal fatty acids.
1960 New Scientist 14 July 136/3 For an age determination it is not sufficient only to analyse the mineral for uranium, thorium and total lead, but the lead must also be analysed isotopically.
1963 G. Troup Masers & Lasers (ed. 2) viii. 136 The electrons were localized on donor (Phosphorus) atoms in isotopically pure silicon of atomic weight 28 which has no nuclear magnetic moment.
1970 Nature 23 May 738/2 The solar wind may actually deposit isotopically heavier carbon on the lunar surface.
1970 D. W. Tenquist et al. Univ. Optics II. v. 190 Isotopically pure elements must therefore be used.
b. By means of isotopes or isotopic methods.
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the world > matter > physics > atomic nucleus > radioactive isotope > [adverb]
isotopically1954
radioisotopically1955
the world > matter > chemistry > elements and compounds > isotopes > [adverb] > using isotopes
isotopically1954
1954 New Biol. 16 74 The behaviour of isotopically labelled molecules.
1959 Times 15 May 3/3 (advt.) Vacancies for Chemists to work on the following projects:..c) the synthesis of isotopically labelled compounds.
1964 G. H. Haggis et al. Introd. Molecular Biol. ii. 33 Many steps in the metabolic pathways of cells have been discovered or confirmed using isotopically labelled compounds.
1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles xii. 272 The rarity of isotopically datable rocks in the Triassic System of Britain and north-western Europe presents a further problem.
This entry has not yet been fully updated (first published 1976; most recently modified version published online September 2021).
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adv.1933