The cylindrical waveguide system [Guy et al., 1979] consisted of individual exposure tubes made of galvanised wire screen that contained a plastic chamber (with a floor of glass rods) to house a rat allowed to move freely.
An increase in both types of DNA breaks was observed after exposure to either the pulsed or continuous-wave radiation, but no significant difference was observed between the effects of the two forms of radiation.
National Institute of Environmental Health Sciences (NIEHS), North Carolina, USA
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