This International Standard? specifies a method of determining the total emitted acoustic power of ultrasonic transducers based on the use of a radiation force balance;? establishes general principles for the use of radiation force balances in which an obstacle (target) intercepts the sound field to be measured;? establishes limitations of the radiation force method related to cavitation and temperature rise;? establishes quantitative limitations of the radiation force method in relation to diverging and focused beams;? provides information on assessment of overall measurement uncertainties.This International Standard is applicable to:? the measurement of ultrasonic power up to 1 W based on the use of a radiation force balance in the frequency range from 0@5 MHz to 25 MHz;? the measurement of ultrasonic power up to 20 W based on the use of a radiation force balance in the frequency range 0@75 MHz to 5 MHz;? the measurement of total ultrasonic power of transducers@ preferably with well-collimated beams;? the use of radiation force balances of the gravimetric type or force feedback type.NOTE The titles of all publications referred to in this Standard are listed in the Bibliography.