| Definition: | a filter composed of tin, copper, and aluminium that transmits more radiation than a copper filter that produces radiation of the same half value layer
NOTE – Commonly used Thoraeus filters are:
Th 1: 0,4 mm Sn; 0,25 mm Cu; 1 mm Al
Th 2: 0,8 mm Sn; 0,25 mm Cu; 1 mm Al
Th 3: 1,2 mm Sn; 0,25 mm Cu; 1 mm Al
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