A proposal concerning the absorbed dose conversion factor.

Abstract:

:New definitions of the absorbed dose conversion factors Clambda and CE are proposed. The absorbed dose in water is given by the product of absorbed dose conversion factor, exposure calibration factor, ionisation chamber reading, cap displacement correction factor and perturbation correction factor. At exposure calibration the material of the build-up cap must be the same as that of the chamber wall. An ionisation chamber of which the wall material is water-equivalent or air-equivalent may be used. In the latter case the wall must be thin. For these two cases absorbed dose conversion factors are introduced and it is recommended that either of the two sets should be adopted. Furthermore, if the chamber wall is neither water- nor air-equivalent, the factor by which these currently defines values should be mutliplied is also given: again the wall must be thin. The ICRU definitions of Clambda and CE are inconsistent, as recently pointed out, while the definitions presented here are consistent.

journal_name

Phys Med Biol

authors

Shiragai A

doi

10.1088/0031-9155/23/2/003

subject

Has Abstract

pub_date

1978-03-01 00:00:00

pages

245-52

issue

2

eissn

0031-9155

issn

1361-6560

journal_volume

23

pub_type

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