Dr. Pawel Mekarski heads the Radon Technical Operations Section at the Radiation Protection Bureau, Dr. Mekarski has specialized in the measurement of environmental radioactivity from both naturally occurring sources and human nuclear activities. He draws from his many years of experience in quantifying radioactive gases within the atmosphere, such as radon, to lead the technical research required to gather data, fill gaps and provide evidence to effectively address the challenges that Canadians face from indoor radon exposure.