Self-contained gaseous contaminant dosimeter
AssigneeE. I. Du Pont de Nemours and Company
InventorElbert V. Kring
Life of this patent
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Abstract
A personal dosimeter for measuring the average concentration of a gaseous contaminant over a given period of time is provided. The dosimeter comprises a sealed pouch having a reaction chamber, which contains a gas-collecting medium, and at least one compartment. Each compartment can be separately sealed and can contain a different reagent, the seals being individually breakable such that the reagents can be separately released into the reaction chamber. Into the pouch is sealed a gas diffusion device that permits the contaminant to diffuse into the reaction chamber where it is collected in proportion to its ambient concentration.
Claims11
A personal dosimeter for measuring the average concentration of a gaseous contaminant over a given period of time comprising:
- a pouch-like receptacle of polymeric material having at least one compartment, the compartment occupying less than the total volume of the receptacle, leaving a reaction chamber, the compartment containing a pre-determined quantity of a color-forming reagent and being adapted to release the reagent into the reaction chamber independently of any other reagents present in any other compartments, and the reaction chamber containing a collecting medium for the gaseous contaminant;
- and
- a gas diffusion device which is sealed into a boundary of the receptacle and through which the contaminant diffuses at a rate in linear proportion to its concentration in the atmosphere, the diffusion device providing the only communication between the atmosphere and the interior of the reaction chamber.
Dependencies are inferred from the claim text.