Since 2000, her research has evaluated the risk of cancer and other medical conditions from exposure to ionising radiation (such as gamma-rays and X-rays), using applied statistical or quantitative methods. She served on the World Health Organization's expert panel that assessed radiation-related cancer risk after the nuclear accident in 2011 at the Fukushima power plant in Japan. She also developed epidemiological models for thyroid cancer risk associated with the 1986 accident at the Chernobyl nuclear power station. Other research has related to Japanese survivors of the World War II atomic bombs in the Life Span Study cohort, as well as German uranium miners at Wismut's mines.