AN APPARATUS FOR MONITORING THE RADIOACTIVITY OF A PLURALITY OF LIQUID SCINTILLATION SAMPLES DEPOSITED ON MULTI-WELL SAMPLE PLATES

摘要

The present invention relates to a new apparatus used in the field of liquid scintillation counting. Such an apparatus effects of liquid scintillation samples or corresponding samples directly from the sample holder plates (10), which comprise a plurality of samples separate wells (11) or vials. The apparatus includes one or more sensors for counting one or more samples at a time. The sample-holder plate (10) is placed manually or automatically between a pair of photomultiplier tubes (14 a, 14 b) that work together to form the device's detector. The lower photomultiplier tube (14 a) is provided with a light pipe (12). The apparatus comprises a moving mechanism that can place the lower photomultiplier tube (14 a) with the light pipe in the upper and lower positions. In the upper position, the walls of the light pipe (12) are pressed tightly against the photomultiplier tube (14 a), so as to form an optically closed compartment around the sample well (11) is in position counting. To prevent passage of light between the sample wells (11) through the sample holder plate material (10), either one and / or other areas between the wells (18) of the sample holder plate (10) are painted black or this region (18) is treated in another way to prevent the passage of light between the sample wells (11).