During the 1960s, what scale of impurity concentration was Snitzer primarily fighting against that caused light scattering or absorption?

Answer

Parts per million (ppm)

When Snitzer was working to lower attenuation, the impurities causing issues like scattering or absorption were measured in parts per million (ppm).

During the 1960s, what scale of impurity concentration was Snitzer primarily fighting against that caused light scattering or absorption?
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