masashi kato, nhk world. >>> tuesday mark ed 71 years since an atomic bomb was dropped on nagasaki. today the word hibakusha, meaning atomic bomb survivor in japanese, is recognized around the world. to be acknowledged as hibakusha, survivors need a special notebook. nhk world's aki shibuya reports. >> translator: let us work to achieve the elimination of nuclear weapons together. >> reporter: toyokazu ihara is a hibakusha. he has an organization that supports survivors like himself. we visited him in his office. ihara has been active in his efforts to promote one specific thing -- >> translator: the hibakusha notebook is issued to people recognized as atomic bomb survivors. >> reporter: the hibakusha notebook is a certificate that proves one is an atomic bomb survivor. it's given to those who suffered from bombs dropped in hiroshima and nagasaki. information like the holder's location at the time of the bombing and medical history is written inside. people with these notebooks can receive four free medical examinations a year and have other medical expenses paid, too. they also rec