Soldiers involved in British nuclear bomb tests in the South Pacific were making a new demand Tuesday for medical research into the effects of the radiation releases - 50 years after the blinding white flashes lit a remote pacific atoll. Servicemen who took part claim that the high rates of skin cancer and health problems suffered by their families are likely linked to genetic damage caused by explosions on Christmas Island, off Australia's eastern coast. The tiny coral atoll was the site of a string of tests from 1952 to 1962, as Britain tested thermonuclear weapon designs.