X(r) 2 Y(r) Figure 1.2 is a plot of Y(r) versus X(r) calculated by assuming that the relative importance of build-up is inversely proportional to X(r). Thatis, X(r) q(x) = a(X)p, where a(X)r, is the build-up for equilibrium spectrum. The correction factor shown is for a low H content and is therefore conservative. Thatis, errors will occur from overestimating, not underestimating, dose rates. For modern weapons with small amounts of high explosive, X(r) will probably never exceed three. 14

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