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Beta Imager - Operating principle |
- Samples (1) are placed in a dedicated sample holder (2).
- The sample holder is placed on a motor driven drawer which is automatically positioned so as to close off the gaseous detector (3).
- A 98% Argon and 2% Triethylamine gas mixture (4) circulates through the detector.
- High voltages (5) are applied between the parallel grids of the detector.
- Each Beta particle entering the detector ionizes the gas along its trajectory, and UV light (6) is emitted in proportion to the number of particles.
- Each light spot is measured by the intensified CCD camera and individually counted or rejected by a spot selection algorithm.
- The actual center of the light spot is calculated to obtain maximum precision on the incident Beta particle position when entering the detector. This ensures very high resolution.
- The counted Beta particles are accumulated in real time into the autoradiographic image displayed on the PC screen.
