102 resultados para Sampling.


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National Highway Traffic Safety Administration, Washington, D.C.

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Cover title.

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Because the use of filters to sample particulate matter suspended in the upper atmosphere has been investigated and has yielded rather disappointing results, an examination of other methods of upper atmospheric sampling is desirable, and this is the aim of the present report. The nature of any radioactive material, and its relation to the size and composition of the suspended particles is of particular interest.

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"February 1990."

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Texas Department of Transportation, Austin

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National Highway Traffic Safety Administration, Washington, D.C.