What is an IM-270?

• A. Self indicating of accumulation of exposure to the wearer.
• B. External dosimeter for gamma radiation.
• C. Emergency signaling device.
• D. Temperature sensor.

Answer: (A)

IM-270 is a self-indicating personal dosimeter worn to monitor the cumulative ionizing radiation dose a wearer has received. It provides a direct, visible readout of exposure, so the wearer and supervisors can quickly assess whether limits are being approached without needing a separate reader. This differs from external dosimeters that must be read by an instrument to determine dose. It is not an emergency signaling device and not a temperature sensor.