Definition of dosimeter
: an instrument for measuring and monitoring exposure to doses of radiation (such as X-rays or gamma rays)
Her team used a mathematical model and dosimeter readings to estimate neighborhood radiation exposures for the nearly 160,000 people living within a 10-mile radius of the plant.— Rick Weiss
— see dosimetry
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Merriam-Webster unabridged
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Time Traveler for dosimeter
The first known use of dosimeter was in 1906
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