Answer :
Final answer:
The characteristic that does not apply to ultrasound at normal diagnostic intensity levels is 'ionizing'. Unlike other imaging techniques, ultrasound does not use ionizing radiation but instead uses high-frequency sound waves. This makes it noninvasive, atraumatic, nontoxic, and safe for use.
Explanation:
Among the characteristics given, the one that does not apply to diagnostic ultrasound at normal diagnostic intensity levels is c. ionizing. Diagnostic ultrasound is a noninvasive and atratumatic medical imaging technique. It is also nontoxic and involves energy absorption by the body's tissues.
However, unlike x-rays, CT scans, PET scans, and isotopic studies, ultrasound does not utilize ionizing forms of radiation. This makes it a safer option, especially in scenarios such as monitoring pregnancies. Consequently, its non-ionizing nature means there's no risk of radiation-related harm or damage to living tissues.
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