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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 spatial γ (gamma) dose of 50cm (in some cases 1m) on the ground at one central location of park use, such as the open space of each park.
2 Radiation doses at locations that may become microspots (b)
Of the facilities in the park, based on the use of children, measure the γ (gamma) dose of 1cm and 50cm on the ground surface at places that may become microspots.
[Example of measurement point]
- Around playground equipment (sand sandbox, slide exits, under swings, under the complex playground equipment landing, etc.)
- Compost storage area
- On gutters, on rainwater basins, places where rainwater easily accumulates, etc.
Publication of measurement results
The measurement results are divided into general spatial radiation dose (a) in the park and radiation dose (b) at points that may become a micro spot.
Each ward is arranged in Address.
About "standard" of correspondence of radiation dose measurement result in Yokohama-shi
| Surface height | Yokohama-shi |
|---|---|
| １ｍ | Supported at 0.23μSv/h or more as a guide. |
| （50cm） | (approximately 0.23 μSv/h or higher) (If it is 0.23μSv/h or more, measure even 1m.) |
| １cm | Supports 0.59 μSv/h or more as a guide. |
About measuring instruments
There are four types of measuring instruments used for measurement.
Generally, the measured value of the GM meter tube is higher than that of the scintillation detector.
This is due to differences in the mechanisms of the equipment. scintillation detectors have a high degree of radiation sensitivity in a certain direction, and GM Catalometer tubes tend to have higher measurements because they are highly sensitive to lateral radiation doses.
Ａ： TCS-172B (manufactured by Hitachi Aloka Medical, Ltd.)
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 Manufacturing Co., Ltd.)
Detector -CsI(TI) scintillation detector
Ｄ： RDS-30 (manufactured by Million Technology Co., Ltd.)
Detector - Energy-Compensation GM Category
Radiation-related information in Yokohama City
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For inquiries to this page
Green Environment Bureau Park Green Space Department Parks and Green Space Preservation Division
Phone: 045-671-3848
Phone: 045-671-3848
Fax: 045-664-2588
Email address: mk-koeniji@city.yokohama.lg.jp
Page ID: 904-107-915
