The efficiency of your paddles should be tested once construction is complete. Efficiency testing allows you to find out what percentage of ‘hits’ a paddle records. The efficiency test is a comparison of the count rate of muons when they pass through the three “standard” paddles plus the one “test” paddle and when only the three “standard” paddles receive hits. The drawing below shows the arrangement of the four paddles.
Test Paddle 4
The overlap area of the four paddles should be approximately 25 cm2. The standard paddles have a small area that overlaps so that when the test paddle is put into place, the overlap area is completely covered. If this testing mechanism is properly constructed, no cosmic rays should be able to pass through paddles 1, 2, & 3 without hitting the test paddle (4). Ring stands and clamps are available to hold your paddles in place.
% Efficiency =
Your optimum voltage occurs when the paddle is > 95% efficient.