Dosimeters record the total radiation dose a worker or area receives over a shift or longer. A survey meter shows only the dose rate right now, while a dosimeter keeps a running total. Detection covers alpha, beta, gamma and X-ray radiation. Sensitivity reaches 0.1 mSv, and the real-time display lets staff check exposure against annual limits. Compact bodies clip to clothing for personal monitoring. Safety officers use the readings to check that shielding, distance and time limits work. Regular calibration keeps records valid. Typical users include radiology departments, cancer treatment centers, nuclear power plants, isotope labs and industrial X-ray teams.