Unfortunately, there are no credible sources to verify the allegation of whether Sonia Gandhi was involved in Thorium scam worth ₹ 60,00,000 crore.
The government in 2012 says that the Department of Atomic Energy had not issued any license for handling or exporting Monzite or Thorium to any private company. A permit from the Department of Atomic Energy under the Atomic Energy Rules 1984 is necessary for exporting monazite, and violation of this provision is an offense under the Code of Criminal Procedure and is punishable with imprisonment. In 2011, Ilmenite was delisted from the prescribed substances list, and hence for the handling of the mineral, a license from the Department of Atomic Energy was not a requirement.
However, the allegations of Thorium scam against Sonia Gandhi are not investigated as of August 24, 2020, and are unverifiable.