Circulation and Use of Maps - Participatory Mapping: New Data, New Cartography - page 118

but no reactor 4 what's happened?

is reactor 4 now the great unmentionable? 6

The person taking part in the discussion questions the
maps from the atmc.jp Website on the basis that it uses data
provided by TEPCO:

Atmc is not so good. use tepco data. also, reactor 4
is offline and empty, so no instrumentation. 7

In addition to challenging the sources used, another way
of undermining the credibility of a measurement is to
question the tools used. From the Safecast list, Dirk starts a
discussion thread by announcing some very high numbers
reported by Greenpeace:

Sad sad sad http://ex-skf.blogspot.com/2011/06/
radiation-in-japan-greenpeace-detected.html.
Some frighteningly high numbers in there…

360µSv/h in removed soil, for example. 8

But Kalin responds straightaway by questioning the data-
collection methods, arguing that the device used by
Greenpeace is very hard to handle and that their results are
therefore certainly biased:

The Greenpeace folks used Georadis RT-30
portable radionuclide identifier (http://
www.georadis.com/pdf//en/rt30.pdf) similar to our
SAM940 (2" NaI scintillator MCA). As we have

6 Anonymous comment, May 25, 2011, 4:26. See: http://ex-skf.blogspot.com/
2011/05/haruki-detarame-falsehood-madarames.html.
7 Anonymous comment, May 25, 2011, 4:37. See: http://ex-skf. blogspot.com/
2011/05/haruki-detarame-falsehood-madarames.html.
8 Message by Dirk, June 21, 2011, 5:26. See: https://groups.google.com/
group/safecast-japan/browse_thread/thread/c0b2c67b8e23c02e?hl=
en&noredirect=true.