Which of the following is NOT a common use of radiation?

The correct choice identifies water filtration as not being a common use of radiation. In radiation applications, medical imaging involves techniques such as X-rays or CT scans, which use radiation to create images of the body for diagnostic purposes. Industrial inspection uses radiation, such as gamma rays, to evaluate materials and structures for quality assurance and safety, helping to locate flaws or defects. Food preservation, commonly through processes like irradiation, employs radiation to kill bacteria and pests, extending the shelf life of foods.

In contrast, water filtration typically relies on physical, chemical, or biological methods to remove contaminants from water rather than employing radiation as a primary treatment method. While some processes may involve radiation for specific cases, it is not a widely recognized or routine application in water filtration compared to other fields such as medicine, industry, and food safety.