![]() The purpose of this paper is to find the real explanation of why the PSF and, therefore, TAR were underestimated for so long. However, it was not clear why previous determinations of TAR were in error: it was not, as some workers argued, because scattered radiation had been included in the absorbed dose in the miniphantom, because TAR data in BJR Supplement 17 had been derived from peak scatter factor (PSF), which is not based on the miniphantom concept. The need for this was shown by analysis of previous data using scaling laws, together with Monte Carlo calculations and careful re-measurement. ![]() ![]() Values of tissue - air ratio (TAR) in the recent British Journal of radiology (BJR) Supplement 25 have been increased by nearly 2% over the values which have been accepted for the past 30 years. ![]()
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