Abstract
As with the configuration factor, the effective radiation area of a pig is necessary for the estimation of radiation exchange rate between the pig body and surrounding objects. The effective radiation areas of polyhedric surface-model pigs, which were 27, 65 and 88kg in live weight, in a standing posture and represented by the three-dimensional coordinates of many triangular patches, were numerically calculated by the computer graphics technique and the law of solid-angle projection.
The effective radiation areas of 27, 65 and 88kg surface-model pigs were 0.748, 1.24 and 1.72m2 respectively. The ratios of the effective radiation area to the total pig surface area were respectively 0.93, 0.94 and 0.94. The ratios appeared to be almost constant and independent of the physical dimensions of surface-model pigs.
