Shortly after becoming a member of the NSG , Brazil signed the Comprehensive Nuclear - Test - Ban Treaty ( CTBT ) on 24 September 1996 .
Shortly after becoming a member of the NSG , Brazil deposited its instrument of ratification in July 1998 .
Shortly after becoming a member of the NSG , Brazil signed the Comprehensive Nuclear - Test - Ban Treaty ( CTBT ) on 24 September 1996 , and deposited its instrument of ratification in July 1998 .