Agglomerations generated by cleaning

Currently, in nursery schools, etc., accumulations generated by cleaning (see below) of places that may become "micro spots" are stored in places where children on the facility premises do not approach, but 2012 Since February, the radiation dose of these agglomerates has been measured sequentially.

Private companies (two companies) entrusted with business from Motoichi patrol each nursery school and, about plastic bags containing accumulated materials such as earth and sand and dead leaves stored on the premises of the facility, measure the space radiation dose of 1 cm from the surface for each bag. (Measurements will be carried out sequentially by the end of March.)
If the measured value of the plastic bag is 0.59 μSv / h or more at 1 cm from the surface (or 0.23 μSv / h or more (* 1) at 50 cm)), the space at the cleaning place where the accumulated material in the plastic bag was removed. We measure radiation dose and confirm that it is less than standard (※ 2) correspondence of micro spot correspondence of Motoichi.

※１
If the measurement of 1 cm from the surface is 0.23 μSv / h or more and less than 0.59 μSv / h, measure the spatial radiation dose at 50 cm from the surface.
※２
Approx. Ground surface height 1cm: 0.59μSv/h、50ｃｍ： 0.23μSv/h

Facilities where the measured value of 1 cm from the surface of the integrated material (poly bag) was 0.59 μSv / h or more (or 50 cm at 0.23 μSv / h or more)
List (PDF: 136KB)

(1)　Facilities in Tsurumi Ward, Kanagawa Ward, Asahi Ward, Kohoku Ward, Midori Ward, Aoba Ward and Tsuzuki Ward  
TCS-172B Hitachi Aloka Medical, Ltd. (NaI (Tl) scintillation detector)
(2)　Nishi Ward, Naka Ward, Minami Ward, Konan Ward, Hodogaya Ward, Isogo Ward, Kanazawa Ward, Totsuka Ward, Sakae Ward, Izumi Ward
Facilities in Seya Ward
NHC7 manufactured by Fuji Electric Corporation (NaI (Tl) scintillation detector)

Agglomeration (poly bags) whose measured value of 1 cm from the surface was 0.59 μSv / h or more (or 50 cm at 0.23 μSv / h or more) are covered with concrete shielding and cover the whole with a blue sheet, etc. It is temporarily stored in a place where children do not approach. In addition, we have confirmed that the radiation dose in the storage area is less than the standard for response.

About cleaning of places that may become "micro spots"
Following the confirmation of radiation dose higher than the surrounding area around the road gutter in Kohoku Ward in September 2011, it may become a micro spot where children on the premises of a municipal nursery school approach on a daily basis. We urgently cleaned the possible places (*) and removed accumulations such as soil, sand, and dead leaves. In addition, the removed accumulated items are sealed in double plastic bags, covered with blue sheets, etc., to prevent scattering, and temporarily stored in a place where children do not approach them.
In addition, we request that we have you perform similar cleaning about private nursery school or Yokohama nursery room.
※Lower gutters, above and around gutters and rainwater basins, places where dead leaves are collected, slides, outdoor hand-washing areas, etc.