Assessment of Exposure Doses and Decontamination
ＱDoes the radiation dose measured with a personal dosimeter represent the real radiation dose?
ＡRadiation 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).
- 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.
- In what ways does exposure to radiation occur the environment? What kinds of radiation exposures are important in Fukushima?
- What kind of unit is used for the evaluation of radiation dose? What is the relationship between the unit and air dose rates?
- How is the concentration of radioactive cesium measured in air? What is the radiation dose by breathing?
- Is it possible to precisely estimate radiation doses from air dose rates?
- Why are radiation doses measured with personal dosimeters different from those estimated using air dose rates?