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Assessment of Exposure Doses and Decontamination


Does the radiation dose measured with a personal dosimeter represent the real radiation dose?

Radiation doses were measured at many places with different radiation levels by loading a personal dosimeter on a person or a model simulating a human body (called a “Phantom”). The results were compared with those of air dose rates (peripheral dose equivalents).

Fig.1 Relationship between measured values of personal dosimeters and ambient dose equivalent

  • Five personal dosimeters (A1, A2, B, C, D) that were worn on real people were used.。
  • The values in all of the dosimeters showed 0.6~0.7 times of the peripheral dose equivalents.
  • Considering that the radiation dose in an adult is about 0.6 times of the peripheral dose equivalent, radiation doses measured with personal dosimeters are close to the real radiation dose.
  • The same investigation was conducted for children, and similar results were obtained.
  • It is confirmed that measurements with personal dosimeters represent nearly real radiation dose.