Biomedical subjects

Thomas J Overcamp

Publications and source records attributed to Thomas J Overcamp.

3 recordsLinked to original sources

PubMed2007

Solutions to the Gaussian cloud approximation for gamma absorbed dose.

Analytical solutions of the dose rate integral for the Gaussian cloud approximation to the Gaussian plume were developed. A solution for the I1 integral for a ground-level source and for the I2 integral for an elevated source were given in terms of special functions. The I2 solution was also extended for the Berger buildup factor. These enable rapid computation of I1 and I2 to estimate the dose rate.

Air Pollutants, Radioactive↗

PubMed2005

Plume rise in a shear layer with neutral stability.

Several solutions have been published to predict the rise of buoyant plumes in a shear layer with a power-law velocity profile. Each of these solutions is either a special case or is based on oversimplifying assumptions. In this paper, solutions to the plume-rise equations are given for buoyant and nonbuoyant plumes with initial vertical momentum. Solutions are given for both point sources and sources with a finite initial size under neutral stability. For a constant wind speed, these solutions simplify to the conventional plume-rise equations.

Air Movements↗

PubMed2003

Gaseous and particulate emissions from a DC arc melter.

Tests treating soils contaminated with metal compounds and radionuclide surrogates were conducted in a DC arc melter. The soil melted, and glassy or ceramic waste forms with a separate metal phase were produced. Tests were run in the melter plenum with either air or N2 purge gases. In addition to nitrogen, the primary emissions of gases were CO2, CO, oxygen, methane, and oxides of nitrogen (NO(x)). Although the gas flow through the melter was low, the particulate concentrations ranged from 32 to 145 g/m3. Cerium, a nonradioactive surrogate for plutonium and uranium, was not enriched in the particulate matter (PM). The PM was enriched in cesium and highly enriched in lead.

Air Pollutants↗