entech engineering, inc. is a consulting company providing technical support and computer software to the nuclear power industry in the areas of radiological engineering, and atmospheric dispersion of radioactive effluents. codes are available for the radiological evaluation of licensing and severe accidents at light-water nuclear power plants; analyzing radioactive decay products and gamma spectra as a function of decay time; computation of direct-shine radiation doses from gamma rays emanating from a self-attenuating cylindrical source surrounded by a number of containers, and shielded by semi-infinite slabs; determination of atmospheric dispersion and deposition of nuclear power plant effluents during continuous, intermittent and accident conditions, in open-terrain sites, coastal sites and deep-river valleys.