The source, who refused to be identified, told IPS the reaction of the official was that the graph represented fairly crude work on basic theory and was therefore not of concern to the agency.
The agency was given the alleged Iranian graph in 2011, and a "senior diplomat" from a different country from the source of the graph said IAEA investigators realised the diagram was flawed shortly after they received it, according to the Dec. 1 AP story.
The IAEA's familiarity with the Seifritz graph, two years before it was given graphs that bore a close resemblance to it and which the agency knew contained a huge mathematical error, raise new questions about how the IAEA could have regarded the Israeli intelligence as credible evidence of Iranian work on nuclear weapons.
Yukiya Amano, the director-general of the IAEA, refused to confirm or deny in an appearance at the Council on Foreign Relations in Washington Dec. 6 that the graph published by AP was part of the evidence of Iranian "activities" related to nuclear weapons cited by the agency in its November 2011 report."
Amano responded to a question on the graph, "I can't discuss this specific information."
In its November 2011 report, the IAEA said it had "information" from two member states that Iran had conducted "modeling studies" aimed at determining the "nuclear explosive yield" associated with components of nuclear weapon. It said the "information" had identified "models said to have been used in those studies and the results of these calculations, which the Agency has seen."
The "senior diplomat" quoted by AP said the IAEA also had a spreadsheet containing the data needed to produce the same yield as shown on the graph -- 50 kilotonnes -- suggesting that the spreadsheet is closely related to the graph.
Butt observed, however, that the existence of the spreadsheet with data showing the yield related to a 50 kilotonne explosion does not make the graph any more credible, because the spreadsheet could have been created by simply plugging the data used to produce the graph.
Kemp of MIT agreed with Butt's assessment. "If it's simply data points plotted in the graph, it means nothing," he told IPS.
After Butt and Dalnoki-Veress identified the fundamental error in the graph AP had published as evidence of Iranian work on a 50-kilotonne bomb, the Israeli source of the graph and an unidentified "senior diplomat" argued that the error must have been intentionally made by the Iranian scientist who they alleged had produced the graph.
A "senior diplomat" told AP the IAEA believed the scientist had changed the units of energy used by orders of magnitude, because "Nobody would have understood the original...."
That explanation was embraced by David Albright, who has served as unofficial IAEA spokesman in Washington on several occasions. But neither Albright nor the unidentified officials quoted by Jahn offered any explanation as to why an accurate graph would have been more difficult for Iranian officials to understand than one with such a huge mathematical error.
Further undermining the credibility of the explanation, Jahn's sources suggested that the Iranian scientist whom they suspected of having devised the graph was Dr. Majid Shahriari, the nuclear scientist assassinated by the Israeli intelligence agency Mossad in 2010.
No evidence has been produced to indicate that Shahriari, who had a long record of publications relating to nuclear power plants and basic nuclear physics, had anything to do with nuclear weapons research.
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