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Radiation dose in park

●Measurement contents

About park in the city, we measure radiation dose of park. 

1 general space radiation dose (a)

In central place one spot of use of park including open space of each park, we measure space γ (gamma) dose of radioactivity of surface of the earth 50cm (and sometimes 1m).

Radiation dose (b) at point that may become 2 Mike Rothe pots

Among facilities in park, we measure γ (gamma) dose of radioactivity of surface of the earth 1cm and 50cm based on the use situation of child at place that may become Mike Rothe pot.

 [example of measurement point]

  ・The playground equipment outskirts (bottoms of landing of playground equipment compound under sandbox, exit, swing of slide)

  ・Compost depot

  ・Places where rainwater is easy to collect on rainwater Masu on gutter

 

●Publication of result of a measurement

Result of a measurement divides into radiation dose (b) at point that may become general space radiation dose (a) and Mike Rothe pot in park and adds up.

 Every ward, we equal a i u e o order in address.

The ward nameGeneral space radiation dose
(a)
It becomes Mike Rothe pot
Radiation dose (b) at point with possibility
Tsurumi Result indication Result indication
Kanagawa Result indication Result indication
The west Result indication Result indication
Medium Result indication Result indication
The south Result indication Result indication
Konan Result indication Result indication
Hodogaya Result indication Result indication
Asahi Result indication Result indication
Isogo Result indication Result indication
Kanazawa Result indication Result indication
Kohoku Result indication Result indication
Green Result indication Result indication
Green leaves Result indication Result indication
Tsuzuki Result indication Result indication
Totsuka Result indication Result indication
Sakae Result indication Result indication
Spring Result indication Result indication
Seya Result indication Result indication

 

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●About "indication" of correspondence of radiation dose result of a measurement in Yokohama-shi

Higher surface of the earth Yokohama-shi
1m We cope using 0.23μSv/h or more as an indication
(50cm) (we cope using 0.23μSv/h or more as an indication)
(when it is more than 0.23μSv/h, we measure even 1m)
1cm We cope using 0.59μSv/h or more as an indication


●About measuring instrument

Measuring instrument which we used for the measurement has following four kinds.

Generally, measurements of GM counter become higher than scintillation detector.

This depends on difference in mechanism of apparatus, and scintillation detector is sensitive to radiation of constant direction, and measurements tend to appear highly because GM counter is sensitive to lateral radiation dose.

A: TCS-172B (product made in Hitachi Aloka Medical Corporation)

Detector NaI(TI) scintillation detector

B: Mr.Ganma A2700 type (product made in clear pulse company)

Detector CsI(TI) scintillation detector

C: PA -1000 Radi (product made in HORIBA, Ltd. Corporation)

Detector CsI(TI) scintillation detector

D: RDS -30 (product made in million technology company)

Detector energy compensation type GM counter

●Press release documents about radiation of park

Look at press release documents about radiation in park from this.

About result of a measurement of place (so-called Mike Rothe pot) where radiation dose of price that was higher than the [press release] outskirts was measured on September 29, 2011 <new Tsurumi Park>

About result of a measurement of radiation dose in October 14, 2011 <Irifune park> [press release] park

About radiological test result of Inui shiitake which we cultivated in [press release] park on November 4, 2011 <Maioka Park> and processed

About radiological test result of Inui shiitake which cultivated in park on November 8, 2011 <Maioka Park>, and processed (followup)

About radiological test result of ashes made from burned plants (somokubai) which it inflected in [press release] park on November 11, 2011 <Maioka Park> and sold

About result of a measurement of place (so-called Mike Rothe pot) where radiation dose of price that was higher than the [press release] outskirts was measured on November 28, 2011 <Tomioka Yawata Park>

About result of a measurement of place (so-called Mike Rothe pot) where radiation dose of price that was higher than the [press release] outskirts was measured on December 7, 2011 <Kamoike Park>

December 28, 2011 firewood, charcoal, bamboo charcoal, pyroligneous acid, radioactive cesium test result of bamboo vinegar liquid

(as for the inquiry)
City of Yokohama, Environmental Planning Bureau greenery maintenance section
Telephone: 045-671-3848 FAX: 045-633-9171
(reception hours: for from Monday to Friday for from 8:45 to 17:15)

City of Yokohama, Environmental Planning Bureau greenery part greenery maintenance section - June 14, 2011 Making - April 14, 2017 Update
It is inquiry - ks-koeniji@city.yokohama.jp - telephone opinion: 045-671-3848 - FAX: 045-633-9171
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