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The four most common teratogens are  tobacco, alcohol, medications and illegal drugs. Teratogens are substances that could harm a developing fetus by affecting growth and causing birth defects or death.
The most common radioisotope used in diagnosis is technetium-99, with some 35 million procedures per year (16.7 million in USA in 2012, 550,000 in Australia), accounting for about 80% of all nuclear medicine procedures worldwide.