G Victor Rajamanickam of Priest University, Thanjavur, wanted a Special Investigation Team to probe the matter.
The first bench, comprising Chief Justice Sanjay Kishan Kaul and Justice M M Sundresh, issued notices to the governments and adjourned the matter to March 17.
The scientist alleged the state government had allowed V V Minerals in Tirunelveli district and others to export 4.55 lakh metric tons of 'placer' minerals from various areas along the coastline from September 18, 2013 to May 30, 2014, despite two Government Orders banning beach sand mining in the state.
Monazite is a highly radioactive mineral and only government-owned Indian Rare Earth Limited is permitted to handle it, he said.
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The PIL alleged rampant and largescale violation of payment of royalty, sales tax and excise duty, and added that there was reason to believe that huge quantities of thorium rich monazite have been clandestinely moved out of the country.
The petitioner said though the Collectors kept issuing show cause notices to the firms, the latter closed them as if nothing serious was found. The role of the Collectors should be probed for appropriate action, he said.