 The bhangmeter results and other data suggested the bomb yielded about , and that was the accepted yield in technical literature until 1991 when Soviet scientists revealed that their instruments indicated a yield of .As they had the instrumental data and access to the test site, their yield figure has been accepted as more accurate.In theory, the bomb would have had a yield in excess of if it had included a uranium-238 tamper but, because only one bomb was built to completion, that capability has never been demonstrated.