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The attenuation of longitudinal ultrasonic waves originating from their interaction with phonon gas and from other thermoelastic causes has been evaluated in CsCl, CsBr, and CsI at 300°K by using second‐order elastic moduli and third‐order elastic moduli, in the 〈100〉 and 〈110〉 directions, and shear waves polarized along the 〈100〉 and 〈11¯0〉 directions. The phonon viscosity and dislocation drag along the 〈100〉 and 〈110〉 directions are also discussed.