Evaluation of a Method for the Determination of Injury Risk of Ultrasonic Radiation in a Liquid Medium

摘要

A method for the evaluation of injury risk to workers in industries using ultrasonic radiations in a liquid media is described and discussed. The method involves the exposure of the lower extremities of intact animals to ultrasonic radiations at a frequency of 20.5 kHz and a power density of 247 watts per liter. The assessment of injury in the intact living animal utilized the measurement of the serum enzyme levels of lactic and malic dehydrogenase, alkaline phosphotase and aldolase. No statistical differences were noted in the serum enzyme levels before and after exposure to ultrasonic radiations. The assessment of injury in the post mortem animals utilized morphological and histochemical staining of skin and muscle and morphological staining of bone marrow which had been exposed to ultrasonic radiation. No pathological alteration of the tissues either grossly or microscopically was observed. In conclusion it can be said that ultrasonic radiations of the frequency and power density present in ultrasonic cleaners are not capable of producing injury in the intact animal. Thus the risk to industrial workers is very probable negligible. (Author)