A group of atomic bomb survivors in Tokyo urged the government Wednesday to conduct a broader study on health and other issues related to the children of survivors, after finding in its own survey that around 60 percent of respondents "harbor concerns."

According to a report issued by the Tokyo Federation of A-Bomb Sufferers Organizations, 400 of the 660 respondents born after World War II to survivors of the 1945 bombings and residing in Tokyo said they are worried because their parents were exposed to radiation 70 years ago.

Of the 400, 22.1 percent said they link their own health problems to radiation, according to the survey conducted from January to February 2013 covering 2,391 of the so-called second generation hibakusha.