Recommended values of the humidity correction factor Kh for determining exposure with cavity chambers at 60 Co energies

The meaning of the humidity correction factor k sub h, required for determining the exposure for Co-60 photons, with cavity chambers, is explained. Experimental values of k sub h are commented on a method for estimating k sub h numerically at any particular conditions of relative humidity, pressure and temperature is indicated. A table of k sub h calculated for relative humidity varying from 0% to 90%, for pressures in the range of 70 kPa to 104 kPa and temperatures between 15 C and 30 C, is included.