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Radiation dose in the park
Last Updated March 31, 2023
Measurement contents
About park in the city, we measure radiation dose of park.
1 General spatial radiation dose (a)
We measure space γ (gamma) dose of 50cm (1m in some cases) on the surface of the ground at one central place of park use such as open space of each park.
2 Radiation dose at locations that may become microspots (b)
Measure γ (gamma) doses of 1 cm and 50 cm on the surface at places that may become micro spots among the facilities in the park, based on the usage of children.
[Example of measurement points]
- Around playground equipment (sandbox, slide entrance, under swing, under dance ground of compound playground equipment, etc.)
- Compost storage
- Above gutters, on rainwater basins, places where rainwater can easily accumulate, etc.
Announcement of measurement results
The measurement results are calculated separately for general spatial radiation dose (a) in the park and radiation dose (b) at points that may become microspots.
Each ward is lined up in Address.
About "standard" of correspondence of radiation dose measurement result in Yokohama-shi
| Surface height | Yokohama-shi |
|---|---|
| １ｍ | Response to 0.23μSv/h or more as a guide |
| （50cm） | (0.23 μSv/h or more as a guide) (If it is 0.23μSv / h or more, measure even 1m.) |
| １cm | Response to 0.59 μSv/h or more as a guide |
About measuring instruments
There are four types of measuring instruments used for measurement.
In general, the measured value of the GM meter tube is higher than the scintillation detector.
This is due to differences in the mechanism of the device. Scintillation detectors tend to have high sensitivity to radiation in a certain direction, and GM tubes tend to have high measurement values because they are sensitive to the radiation dose in the lateral direction.
Ａ： TCS-172B (manufactured by Hitachi Aloka Medical)
Detector-NaI (TI) scintillation detector
Ｂ： Mr. Ganma-A2700 type (manufactured by Clear Pulse)
Detector - CSI(TI) scintillation detector
Ｃ： PA-1000-Radi (manufactured by Horiba Works)
Detector - CSI(TI) scintillation detector
Ｄ： RDS-30 (manufactured by Million Technology)
Detector-energy-compensated GM meter pipe
Radiation-related information in Yokohama City
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Inquiries to this page
Green Environment Bureau Park Green Area Parks and Green Space Preservation Division
Telephone: 045-671-3848
Telephone: 045-671-3848
Fax: 045-664-2588
Email address: mk-koeniji@city.yokohama.lg.jp
Page ID: 904-107-915
