Abstract
IN practice, the mass of a neutral atom is expressed in terms of a particular nuclidic mass which is assumed to have an integral value and is termed the primary standard. With 12C as the primary standard (126M = 12u) nuclidic masses are found to be close to integral values and the difference between the measured mass (AZM) and the integral value Au is called the ‘mass excess’1. Alternatively, the mass of a nuclide (A, Z) relative to 12C could be expressed in the form: where Z(Δ)A12 is a small proper fraction (±) which will be referred to as the ‘mass fraction’. It should be noted that the ‘mass fraction’ is a dimensionless quantity whereas the ‘mass excess’ equals Z(Δ)A12 u.
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