Science: New Jobs for Radioactivity

Radioactive tracers, which have revolutionized medical and biological research, are now going to work in industry. This week Arthur D. Little, Inc. of Cambridge, Mass, told how it used the tracer technique to solve a steel problem.

Steel manufacturers know that sulphur (an undesirable impurity) gets into steel from the coal used as fuel. But there are two types of sulphur in coal: organic and "pyritic" (iron sulphide). Republic Steel Corp. wanted to know whether either type is driven off when the coal is made into coke. There was no handy chemical way to find out, but the Little Co.'s scientists worked...

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