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Radioactivity and Air Dose Rate


How are air dose rates expected to change over time, based on current knowledge? 【Example of analysis】

Since the Fukushima accident, various institutions have surveyed the distribution of air dose rates using a wide range of measuring methods.
Air dose rate data with different characteristics have been obtained by these measuring methods. By integrating these data, we can create an air dose rate map with high accuracy and high spatial resolution across the target area.
For the creation, a hierarchical Bayesian statistical method may be used to perform computer-based estimations.

This statistical method helps to estimate uneven distribution of air dose rates with high resolution across the wide area affected by the accident.
By comparing the estimates with airborne monitoring results, we can generally correct some estimated values that are higher due to systemic reasons and reproduce a detailed distribution status.

Image of the integration of maps

Fig.1 Image of the integration of maps