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Length of stain dosimeterPayload customers for the Space Shuttle have recently expressed concerns about the possibility of their payloads at an adjacent pad being contaminated by plume effluents from a shuttle at an active pad as they await launch on an inactive pad. As part of a study to satisfy such concerns a ring of inexpensive dosimeters was deployed around the active pad at the inter-pad distance. However, following a launch, dosimeters cannot be read for several hours after the exposure. As a consequence factors such as different substrates, solvent systems, and possible volatilization of HCl from the badges were studied. This observation led to the length of stain (LOS) dosimeters of this invention. Commercial passive LOS dosimeters are sensitive only to the extent of being capable of sensing 2 ppm to 20 ppm if the exposure is 8 hours. To map and quantitate the HCl generated by Shuttle launches, and in the atmosphere within a radius of 1.5 miles from the active pad, a sensitivity of 2 ppm HCl in the atmospheric gases on an exposure of 5 minutes is required. A passive length of stain dosimeter has been developed having a sensitivity rendering it capable of detecting a gas in a concentration as low as 2 ppm on an exposure of five minutes.
Document ID
19960002730
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Lueck, Dale E. (NASA John F. Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
August 17, 2013
Publication Date
April 12, 1994
Subject Category
Spacecraft Propulsion And Power
Accession Number
96N12739
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,302,351|NASA-CASE-KSC-11574
Patent Application
US-PATENT-APPL-SN-976853

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