Dosimeter for monitoring working areas

Details Dosimeter for monitoring working areas Dosimeter for monitoring working areas

G - Physics

01

N

73/97

G01N 1/22 (2006.01) G01N 1/24 (2006.01)

Patent

CA 1062498

ABSTRACT OF THE DISCLOSURE An improved dosimeter for monitoring working areas in which air, preferably in a relatively large volume, is pumped through he dosimeter at a controlled constant flow and any particles or vapors in the air are collected on a filter, the improvement is the use of a variable drive pump connected to the filter and driven by an electric motor and controlled by a feed back circuit of an integrator and an amplifier and the pump maintains a constant flow of air through the dosimeter; in the operation of the dosimeter the integrator receives a signal from a pressure switch that detects changes in the flow of the air stream through the dosimeter by a change in a pressure drop of the air which is being pumped through an orifice; the dosimeter is placed in a work area and at the termination of a period of time, such as a work day, the filter is removed and the contents collected are analyzed by conventional techniques such as gas chromatography to determine a level of exposure of individuals working in that area.

303833

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