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Standard Atomic Weight Values for the Mononuclidic Elements: 2001.

DE2001782053

Publication Date	2001
Personal Author	Holden, N. E.
Page Count	8
Abstract	Atomic Mass Evaluations have had a major impact on the values of the atomic weights for the twenty mononuclidic elements plus two elements, Thorium and Protactinium, which have no stable nuclides but a characteristic terrestrial isotopic composition. This paper reviews the history of the atomic weight values of these elements in the years, since the reference mass standard changed from (sup 16 O) to (sup 12 C). There is a problem for Thorium, which is considered to have an abundance value of 100%, but is not treated as such in the Standard Atomic Weights Table. Recommendations for handling the Standard Atomic Weight values for 2001 are presented.
Keywords	Atomic mass Isotopes Standards Tables(Data) Oxygen isotopes Standard atomic weights Mononuclidic elements
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY.; Department of Energy, Washington, DC.
Supplemental Notes	See also DE86001168. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200123
Contract Number	DE-AC02-98CH10886

Standard Atomic Weight Values for the Mononuclidic Elements: 2001.

Standard Atomic Weight Values for the Mononuclidic Elements: 2001.
DE2001782053

Publication Date	2001
Personal Author	Holden, N. E.
Page Count	8
Abstract	Atomic Mass Evaluations have had a major impact on the values of the atomic weights for the twenty mononuclidic elements plus two elements, Thorium and Protactinium, which have no stable nuclides but a characteristic terrestrial isotopic composition. This paper reviews the history of the atomic weight values of these elements in the years, since the reference mass standard changed from (sup 16 O) to (sup 12 C). There is a problem for Thorium, which is considered to have an abundance value of 100%, but is not treated as such in the Standard Atomic Weights Table. Recommendations for handling the Standard Atomic Weight values for 2001 are presented.
Keywords	Atomic mass Isotopes Standards Tables(Data) Oxygen isotopes Standard atomic weights Mononuclidic elements
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY.; Department of Energy, Washington, DC.
Supplemental Notes	See also DE86001168. Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200123
Contract Number	DE-AC02-98CH10886