Circulation and Use of Maps - Participatory Mapping: New Data, New Cartography - page 115

(for instance to post new data or recruit volunteers to go out
and measure radiation levels), and an open list used for
debating and commenting about official and non-official
stakeholders involved in the measurement of radiation levels
in Japan.

7.2.1. Verifying the data in emergency situations

Maps are used as a support to compare radiation
measurements from different sources and to confirm or
discard radiation measurements. An article published on the
EX-SKF blog commented on the fact that a Japanese tourism
agency invited people to visit Fukushima claiming that the
region was safe 2 . In the comment section, the first person to
react argues, on the contrary, that the radiation levels at the
margins of the Fukushima nuclear power station are
20 millisivierts, which corresponds to the maximum annual
amount of radiation allowed for the nuclear industry staff in
the United States. As a result, a second Web user challenges
that number by referring to the Safecast map:

Anon, are you sure it wasn't 20 MICRO-sieverts?
The figure you give doesn't correspond to

anything Safecast are measuring up there.

http://maps.Safecast.org/ 3 .

Further in the comments to the same article, Professor
Hayakawa's maps (Table 6.1, no. 8) are also cited and
discussed to argue against the government's statements as to
the alleged safety of the Fukushima region:

If anyone has ever seen the radiation maps EX
SKF has so generously posted from Professor

2 Http://ex-skf.blogspot.fr/2011/12/fukushima-i-nuke-plant-cold-shutdown.
html.
3 Anonymous comment, December 19, 2011, 21:43. See: http://ex-
skf.blogspot.com/2011/12/fukushima-i-nuke-plant-cold-shutdown.html.