Abstract
Prompt detection of airborne contamination is essential in plutonium-handling facilities because the materials normally involved are extremely toxic. Impaction type continuous monitors for airborne alpha contamination, as described by Collins, have been in use at the Savannah River Plant (SRP) and at the Savannah River Laboratory (SRL) since 1956. The monitors originally used had definite limitations. They utilized moving tape as a collection medium and were limited by a delay in response and by low collection efficiency. A monitor which promptly detects low concentrations of airborne alpha contamination has now been developed. This article presents monitor design and SRP operating data.

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