Abstract
To meet the need for absolute standards of absorbed dose for X-rays, the National Physical Laboratory together with other national laboratories is investigating methods based on microcalorimetry. The ideal would be to measure “local” absorbed dose in materials such as soft tissue to which water would represent a fairly satisfactory approximation. However, as Report 14 of the International Commission on Radiation Units and Measurements1 states, “the direct determination of the absorbed dose at a point in a liquid (for example, water) has not been feasible primarily because of difficulties of achieving homogeneity of the irradiated system”. An indirect method, in which the absorbed dose is determined in a solid “reference” material, is thus at present used.
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KEMP, L., MARSH, A. & BAKER, M. Pyrolitic Graphite Microcalorimeter for the Measurement of X-Ray Absorbed Dose. Nature 230, 41–42 (1971). https://doi.org/10.1038/230041a0
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DOI: https://doi.org/10.1038/230041a0
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