Most hibakusha surveyed think Japan should join the U.N. treaty banning nuclear weapons, underscoring their discontent with the government's opposition to the agreement.

The results of the survey by Kyodo News, released Saturday ahead of the 73rd anniversary of the atomic bombings next month, also showed that more than 60 percent of the survivors do not discuss their experiences due to old age or reluctance to remember the details of the aftermath.

The issue of passing on the memory of the 1945 bombings has become more urgent as the ranks of those who witnessed the horrors firsthand decline.