* Data from other locations can also be viewed from the above websites.
(Note) Normally, the air dose rate measured is due to natural radiation from the earth, etc., but the radiation comes from natural radioactive materials present in the walls, floors, and ceilings of buildings.
Is also out. For example, the amount of radiation in buildings and tunnels is greater than that in the outside, and in urban areas where there are many concrete buildings outside, the air dose rate
The value of may be slightly higher. In addition, when it rained, dust drifting in the air was dropped on the surface by rain, and as a result,
Short-lived natural radioactive materials (Lead-214: half-life about 27 minutes, bismuth-214: about 20 minutes, etc.) will be collected on the ground.
As a result, the air dose rate may temporarily increase on rainy days.
(Reference) Niigata Prefecture Disaster Prevention Bureau Radiation Monitoring Center website “Tell me why the radiation dose differs depending on the weather and location”
* For health effects due to radiation, please refer to the “Unified Basic Data on Radiation Health Effects” (Japanese / English) on the Ministry of the Environment website.