Scintillation-type ion detector

Claim 1

IN COMBINATION WITH A MASS SPECTROMETER HAVING AN EVACUATED CHAMBER PERMEATED BY A MAGNETIC FIELD, A DEMOUNTABLE LIGHT-TIGHT APPARATUS FOR DETECTING IONS TRAVELING IN SAID MAGNETIC FIELD AND COMPRISING, AN ENCLOSURE REMOVABLY MOUNTED UPON SAID CHAMBER, AN ELONGATED TRANSLUCENT MEMBER EXTENDING FROM WITHIN SAID ENCLOSURE AND HAVING ITS FIRST END WITHIN SAID MAGNETIC FIELD AND ITS SECOND END OUTSIDE OF SAID FIELD, A LUMINESCENT MATERIAL MOUNTED AT SAID FIRST END OF SAID MEMBER, AN ANNULAR ACCELERATING ELECTRODE SURROUNDING SAID FIRST END AND ADJACENT TO SAID LUMINESCENT MATERIAL, AN HIGH VOLTAGE SUPPLY CONCOMPLETELY SURROUNDING SAID FIRST END OF SAID TRANSLUCENT MEMBER, SAID LUMINESCENT MATERIAL AND SAID ACCELERATING ELECTRODE, SAID SHIELD HAVING AN APERTURE FOR THE ADMISSION OF SAID IONS, A PLURALITY OF GRID WIRES AFFIXED ACROSS SAID SHIELD APERTURE FOR SHIELDING THE IONS IN SAID MAGNETIC FIELD FROM THE POTENTIAL APPLIED TO AID ACCELERATING ELECTRODE, WHEREBY IONS ENTERING THROUGH SAID APERTURE ARE ATTRACTED TO SAID LUMINESCENT MATERIAL BY SAID ACCELERATING ELECTRODE CAUSING SAID MATERIAL TO EMIT PHOTONS FOR TRANSMISSION THROUGH SAID TRANSLUCENT MEMBER, AND MEANS DISPOSED ADJACENT SAID SECOND END OF SAID TRANSLUCENT MEMBER FOR THE DETECTION OF SAID PHOTONS.