Safecast seminar

Scanning the Earth
May 30th, 2011

Kei Uehara, Tomo Furutani, Pieter Franken
Murai Lab, Keio Research Center at SFC
Safecast.org Japan

Measuring Radiation
• Overview of Safecast.org
• Measurement Equipment
• Mobile Radiation Measurement
• What have we found
• Scanning the Earth Project

Safecast Factsheet
• Safecast was created 1 week after the 3/11 Japan earthquake.
• Core team of 5 people, almost 50 regular volunteers worldwide.
• Team concentrations in Tokyo, Portland and Los Angeles.
• Raised $37K in 30 days with Kickstarter, exceeding funding goal.
• Currently: 5 mobile "bGeigie" car-based units & 25 handheld sensors
deployed.
• Another 50 devices will be active by the end of June 2011.
• Short term goal is to have 1000 sensors deployed in Japan in 1 year.
• 140,000 measurements done by GPS mapping
• To date 1,135 data submissions to website by crowd sourcing
• Website trafﬁc has exceeded over 270,000 visitors since launch.
• All data collected and published by Safecast is open and available under
CC0 dedication.

Open Global Sensing SAFECAST 05/02/11

Section 2.
SAFECAST ADVISORY TEAM
Joi Ito
is a Japanese activist, entrepreneur, and venture capitalist. Ito has received recognition for his role as an
entrepreneur focused on Internet and technology companies and has founded, among other companies,
PSINet Japan, Digital Garage and Infoseek Japan. He is currently Chairman of Creative Commons and
General Partner of Neoteny Labs, an investor and adviser to Twitter, board member of Mozilla Foundation,
WITNESS, Global Voices, Digital Garage, CCC, Tucows, Technorati, SocialText, and others. Joi was named to
be the director of the MIT Media Lab.

Jun Murai
is a Japanese computer scientist, known as “the father of Japan’s Internet”. A professor at Keio University,
Murai is the founder of JUNET and president of WIDE Project. Murai graduated from Keio University in 1979
and received a Ph.D. from the same school in 1984. He is currently the Dean of the Faculty of Environment and
Information Studies at Keio University.

Ray Ozzie
is an independent software entrepreneur, most recently having served as Chief Software Architect of
Microsoft. Prior to Microsoft he was best known for his work in the area of social productivity as the creator
of both Lotus Notes and Groove. Earlier in his career Ozzie developed Symphony for Lotus. He worked on
Lotus 1-2-3, worked on VisiCalc and TK!Solver at Software Arts, and did distributed OS work at Data General.
Honored as a distinguished alumnus by University of Illinois, Ozzie has been recognized by numerous
organizations including the IEEE and World Economic Forum. He has been inducted as a member of both the
National Academy of Engineering and the American Academy of Arts & Sciences.

Dan Sythe
has designed radiation detection instruments and systems for 33 years. He was consultant and
instrumentation provider for Three Mile Island Public Health Fund and their Scientiﬁc Advisory Board, which
evaluated the TMI Accident, and worked with NRDC, Dr. John Gofman and others to respond to Chernobyl
affected communities. He founded Solar Electronics International (1978), and was Senior Electronic Design
Engineer at Astec BSR (USA) LTD (1980s). He is currently President and Founder of Iospectra - International
Medcom and Founder and Executive Director of nonproﬁt Whalesong Project, focused 11TH AVENUE SUITE 200 PORTLAND, OR 97209
334 NW on ocean health issues.
w: 503.610.8052 e: info@uncorkedstudios.com
SAFECAST!|!334 NW 11TH AVENUE, SUITE 200 PORTLAND, OREGON 97209 |


Section 1.
SAFECAST PHASE 1

Current visualization of data — planned and launched in 72 hours. Safecast will be enhancing this site with more
data, visualization and analysis. As part of our commitment to global use of data, our team has been translating all
334 NW 11TH AVENUE SUITE 200 PORTLAND, OR 97209
materials into English, Japanese and German. Future plans include further real-time translations of all materials (blog
posts, Tweets) into several languages. SAFECAST!|!334 NW 11TH AVENUE, SUITE 200 PORTLAND, OREGON 97209 |


Section 1.
SAFECAST DEVICES
IN CURRENT DEPLOYMENT

Inspector Alert CRM100 bGeigie NETRAD iGeigie
commercially manufactured commercially manufactured original design mobile/car original design stationary original design concept
device built by International device build by International set up. Uses 2 web connected web connected concept device that works with
Medcom, sensitive to Alpha, Medcom, sensitive to Beta Inspector Alert devices and is device. Uses the same iPhones. Limited production,
Beta and Gamma radiation. and Gamma radiation. sensitive to Alpha, Beta and 2” pancake sensor as various sensors and
Gamma radiation. the Inspector Alert and is sensitivities.
sensitive to Alpha, Beta
and Gamma radiation.
Developed in conjunction
with Tokyo Hackerspace.



Section 4.

PHASE 2: SENSOR PROTOTYPE
In preparation for a larger sensor network in partnership with Keio University, our team has considered the technical and design aspects of external
monitors. These renderings are early prototypes. Final designs may vary.

LED & Mode Button

USB OTG for charging &
connection as USB device

Internal Li-Ion battery pack
3.5mm headphone jack for
acoustic interface

USB host port to provide
power as a charger

LND 2” pancake GM tube
“King of Geigers”


Section 4.

PHASE 2: ARCHITECTURE
This diagram demonstrates the early thought of how our project could scale, starting with the sensors deployed in Phase 1. While the details could change as the
project grows, the diagram outlines basic architecture that will acheive the goal of building a reliable, public-facing sensor network.



Section 1.
SAFECAST MOBILE DATA MAPPING

The members of Safecast realized that there were areas in Japan where little or no data was being reported. The
bGeigie (bentoGeigie) was developed to capture data while a Safecast volunteer team drives along Japanese highways. SAFECAST!|!334 NW 11TH AVENUE, SUITE 200 PORTLAND, OREGON 97209 |

Rapid Prototyping
• Volunteer Truck Driver - April 16th
• Keio Research Team - April 20th
• bGeigie / Tokyo Hacker Space - April 23rd
• bGeigie Mini - Battery Powered, SD Card -
May 11th

bGeigie - GPS Radiation Logger

• GPS Logger

• Arduino board for GM interface

• USB memory with Linux, Mac and PC Java applet

• Medcom Geiger Counter a/b/g

• Waterproof and shockproof

• Can be mounted on any car window

Radiation Mapping
• 50 Volunteers from Keio and THS
• 3 bGeigies and 6 Geiger Counters
• 10 cars
• 30 days
• 7000km
• 140,000 Measurements

Japan Scan
140,000 Measurements
30 days
7000km


Section 1.
SAFECAST KICKSTARTER FUNDRAISING

The Safecast team turned to micro-funding site Kickstarter to raise funds that would purchase up to 600 Geiger
Counter devices to be deployed in Japan. At the time of publication, over $34,000 has been raised, which will
purchase a little over 100 Geiger counters. Additional funds will go to purchasing more devices and distributing
them to trained individuals to capture data. SAFECAST!|!334 NW 11TH AVENUE, SUITE 200 PORTLAND, OREGON 97209 |

What have we found?
• Alpha, Beta, Gamma
• •Hotspots
Local Hotspots - Schools and Homes
• Urban Hotspots
• Chiba and Nasu Hotspots

• Contamination is on the ﬂoor, not in the air
• What is it?
• How does it behave?
• How to remove it?

Contamination Properties
• everything is covered with a thin radio-active coating, primarily Cs134 and Cs137
• the coating doesn't dissolve easily in water or rain (as it has not washed off till now)
• it doesn't easily stick to car tires (we measured no increase after one day drive to Koriyama)
• it is high in alpha and beta besides gamma
• Contamination is on top, sky facing. Not under covered areas or sides.
• it sticks to wood, concrete and iron on the surface and is most radioactive on these surfaces
• it penetrates soil only on the surface (1-3cm deep) - as it is in the soil you measure lower as the alpha
component get shielded. Removal of the top soil reduces radiation by 80% or more.
• the coating was not deposited by rain - it is only on surfaces that are in open air. E.g. the top of a
concrete wall is coated, but the sides have nothing (if it was rain it would have stuck on the sides) or
spaces under garden tables are not active, while you would expect rain to have dripped through). It
looks like the areas are 'ﬂashed' rather than rained/snowed on.
• When scrubbing with a brush and water on a wooden table we could remove 50%, by using sand
paper we got it down to 80% (or more as it measured same as back ground radiation)
• Measured the same concrete area 4 weeks ago and this week - in both cases measured around 350
CPM with the Inspector 2" pancake. Despite a month of rain, no signiﬁcant change in levels.

Scanning The Earth Project
• Scan and disclose air radiation dose data
both by mobile and ﬁxed-observation
bGeigies covering almost 100% of the
ground surface (transportation network) in
Japan
• Establish integrated monitoring system on
transportation network via ICT network
• Collect relative data set by calibrating

More information
• Safecast.org (map and blogs)
• Safecast.jp (latest news from Japan)
• @safecastdotorg
• @safecastJapan
• ScanningTheEarth -- http://
web.sfc.keio.ac.jp/~maunz/wiki/index.php?
ScanningTheEarth

And ... iGeigie!

• Build your own iGeigie at Tokyo Hacker Space
• http://www.tokyohackerspace.org/
• www.iGeigie.com

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