Canada's kind and helping hand in the Third World, the Canadian International Development Agency (CIDA), has been enlisted to help sell Candu nuclear reactors in Thailand. The revelation is seen as a scandal by those who monitor foreign aid. As Ottawa's primary agency for dispensing assistance abroad, CIDA's goal is supposed to be the reduction of poverty in developing countries. But a little-circulated report by crown corporation Atomic Energy of Canada Ltd. (AECL) shows CIDA approved and funded a 'public education'' program aimed at convincing Thai high school students of the benefits of nuclear technology. The program, launched in 1995 and still operating, is part of an over-all effort by AECL to sell Canadian nuclear technology to Thailand.