Which safety practice should be followed to avoid harm when operating an XRF device?

• A. Point the machine at the ground to test alignment
• B. Keep the machine at arm's length during sample collection
• C. Should never point the machine directly at any person or oneself
• D. Use only during daylight hours

Answer: (C)

Operating an XRF device involves handling an X-ray beam, so protecting people from exposure is the top safety priority. The best practice is to never point the X-ray beam directly at any person or yourself. Keeping the beam path away from people minimizes the risk of radiation exposure, even if you’re just aligning the instrument or taking a quick reading. Use proper shielding, maintain a safe distance, and perform alignment and calibration with approved targets or phantoms rather than people. If misalignment or a calibration check is needed, do it with the device powered down or in a controlled setup that follows the manufacturer’s safety guidelines.

Pointing at the ground, staying only at a vague “arm’s length,” or doing work only during daylight hours don’t address the fundamental risk of directing X-rays at someone. The safety concern is about human exposure, which is independent of time of day or a rough distance; the correct practice is to avoid directing the beam at people entirely and to follow proper shielding and operational procedures.