Science: Crystal X Ray

Some industries use X rays to look for flaws in their products, but the apparatus is expensive, cumbersome. This week G E announced a new X-ray detector that enables simple equipment to do many inspecting jobs.

Heart of the system is an artificially grown crystal of cadmium sulphide, which acts as a sort of amplifier tube when excited by X radiation. It multiplies by 1,000,000 the energy it gets from X rays so the X-ray generator can be weak, cheap, safe.

In practice, a slender pencil of X rays is shot through the material to be examined. The rays that pass through are...

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