The integrated effective resonance neutron absorption cross section of thorium-232 cylinders has been experimentally investigated by danger coefficient measurements in the Hanford Test Pile. The results were interpreted to yield the effective resonance integral as a function of the surface-to-mass ratio of the thorium cylinders. The experiments were extended to determine the Doppler coefficients resulting from heating the thorium in a constant neutron energy spectrum in the reactor. After correction for 1/v neutron absorption, the effective resonance integral can be approximated as a function of the surface-to-mass ratio by
. The value assigned to the Doppler coefficient of the volume absorption of the effective resonance integral is
. The results are compared to similar measurements on uranium.