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Pulse‐echo ultrasonic attenuation measurements were made for longitudinal and transverse waves in the , , and  propagation directions in NaCl specimens cut from a single boule. The attenuation α was proportional to the orientation factor Ω (relating the resolved stress on the slip system of the crystal to the applied stress), and to the square of the frequency f. Under x‐ray irradiation, α decreased for modes with Ω=≠0 but remained constant where Ω=0. Dislocation damping is considered to cause the loss.