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A description of a "low" energy free-air chamber is given. The standard chamber is designed to measure the exposure dose in roentgens for x-ray beams generated at potentials from 20 to 100 kilovolts-constant-potential (kvcp) with filtrations ranging from 2 mm of beryllium to 2 mm of beryllium plus 4 mm of aluminum. The chamber was compared with a "medium" energy standard at 60, 75 and 100 kvcp with filtrations of 1, 3, and 4 mm of aluminum, respectively. The two standard chambers agreed to within 0.3%. (auth)

Standard free ·air chamber for the measurement of low energy X -rays (20 to 100 kilovolts-constant-potential)