Abstract
The absolute mass of a thin Be layer deposited onto a tantalum backing was determined by differential weighing of four targets to obtain the average areal density before their utilization in a Be(α, n)C cross section measurement. In a number of preliminary investigations, the homogeneity of the sample area was checked non-destructively by measuring the spectral neutron yield when the target was bombarded with an alpha beam in various geometrical arrangements. The inhomogeneities found contributed significantly to the 2.5% total uncertainty on the areal density of the deposit.
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