Patent ID: 7087436
Filing Date: 2006-08-08
Classification: G01N,H01J,Y10T

Abstract:
1. A tubular direct insertion membrane probe (t-DIMP) type mass spectrometer system, comprising, in combination: a countercurrent exchanger (CCE) for receiving a liquid having a gas dissolved therein and a carrier fluid, the CCE comprising a first membrane across which said gas diffuses from the liquid into the carrier fluid; a tubular direct insertion membrane probe comprising a silicone tubing membrane configured to receive carrier fluid exiting the CCE; an ion source configured to direct radiation in a direction of the silicone tubing membrane; and a radiation shield disposed between said ion source and said silicone tubing membrane so as to block a line of sight from said ion source to said silicone tubing membrane so as to prevent direct heating of the silicone tubing membrane by said ion source.