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Safecast
Founded2011; 13 years ago (2011)
FounderSean Bonner, Joi Ito and Pieter Franken
Focusopen citizen science
Location
Methodvolunteer based data collecting, open hardware development, online data network
Key peopleSean Bonner, Joi Ito, Pieter Franken
VolunteersAbout 900 (End of 2016)
Websitesafecast.org

Safecast is an international, volunteer-centered organization devoted to open citizen science for environmental monitoring. Safecast was established by Sean Bonner, Pieter Franken, and Joi Ito shortly after the Fukushima Daiichi nuclear disaster in Japan, following the Tōhoku earthquake on 11 March 2011 and manages a global open data network for ionizing radiation and air quality monitoring.

The Safecast team, with help of International Medcom, Tokyo hackerspace, and other volunteers, has designed various devices for radiation mapping. Haiyan Zhang developed a widely used interactive map of radiation levels around Japan, and was a mapping consultant in the formative phase of Safecast. The Geiger counter-like devices developed include the bGeigie and bGeigie Nano for mobile applications (carborne and walking measurements) as well as fixed stations called Pointcast. Despite being a citizen science project, professional quality and scientific grade data was sought from the onset, and the methodology and tool-sets Safecast developed and deployed are cited in scientific literature and by governments.

All data are collected via the Safecast API and are presented on the publicly available interactive Safecast Tile Map with global coverage.

Safecast later expanded to offer air quality sensors (PM1, PM2.5, PM10 μg/m particulate matter) which also report to open crowdsourced maps.

As of 2020 the project has made 120 million observations and calculated mean dose rates for 330 cities around the world.

bGeigieZen by Safecast

In April 2021 Safecast announced development of a new device called bGeigie Zen. The device will be an updated version of the bGeigieNano(see details below) with a lot of build in additional features like wireless uploading of data, wireless charging, replaceable LiPo battery, etc. More information can be found at https://bgeigiezen.safecast.jp/.

bGeigieZen is based on original bGeigie but uses a new sensor board, the SafePulse and M5Stack modular IoT platform. The presented prototype was built in bigger Pelican 1015 case. It is much simpler to build and can be built in a fraction of the time it would take to build the original bGeigieNano.

The bGeigieZen and other safecast devices can be purchased at safecast devices shop : https://bgiegiezen.safecast.jp


bGeigie Nano

Safecast bGeigie Nano is a portable radiation detector equipped with a Geiger–Müller tube type detector, built-in GPS and logging to microSD card.

  • bGeigie Nano with closed case bGeigie Nano with closed case
  • Safecast bGeigie Nano opened Safecast bGeigie Nano opened
Screenshot of Safecast Tile Map website with data visualization

The bGeigie Nano is available as a kit, so the user needs to learn how to solder in order to build it from the supplied parts. Until November 2020 the kit could be purchased from the Kithub product page. The device was developed in collaboration with International Medcom Inc. and shares some parts with their Inspector Alert detector. According to the Safecast Github page "bGeigie Nano is a lighter version of the bGeigie Mini using an Arduino Fio, a GpsBee, an OpenLog and an Inspector Alert geiger counter. The aim is to make everything fit in a Pelican Micro Case 1040".

The final version of the bGeigie is placed inside the smaller Pelican Micro Case 1010. It features the LND 7317 pancake Geiger-Mueller tube type detector, a GPS receiver and is expandable with a Bluetooth module. The mode switch offers choice between geotagged radiation logging (data saved to microSD card) and measuring without GPS - showing also Bq/m2 (Cs) values. Inside the case the unit is calibrated for gamma radiation. The main unit taken out of its case will additionally do α- and β-detection for careful use as a surface contamination spot meter.

Safecast devices are also used by the following institutions:

Slovenian NGO IRNAS - Institute for development of advanced applied systems Rače / Inštitut za razvoj naprednih aplikativnih sistemov Rače performs monitoring in Slovenia with their one bGeigie

2022 Russian invasion of Ukraine and the “bGeigies for Ukraine” initiative

Following the 2022 Russian invasion of Ukraine and especially the Capture of Chernobyl and the activities of the Russian forces in the contaminated areas of the Chernobyl Exclusion Zone including digging trenches or using the highly contaminated Red Forest as a route for their convoys initiated a request for a new radiation mapping of the region after the withdrawal of Russian troops.

On July 20, 2022 Safecast announced the “bGeigies4Ukraine” initiative (#bgeigies4ukraine) - joint initiative of:

SÚRO provided 10 bGeigie Nano dectectors and following radiation monitoring led to over 300,000 data points gathered as of September 17, 2022.

All the data gathered within #bgeigies4ukraine initiative are part of the interactive Safecast Map and the dataset is available under CC0 license.

Discontinuation of bGeigie Nano kit production, development of alternatives

In November 2020 KitHub announced in their email newsletter stopping the production of the bGeigie Nano kits after 5 years. Two devices are currently under development that could replace bGeigie Nano in the future (the existing devices will remain in service).

CzechRad by SÚRO

CzechRad is a direct bGeigie Nano alternative in development. The device uses same LND 7317 (USA) Geiger tube as bGeigie Nano, same Pelican 1010 plastic case and same output data format (LOG files). Compared to bGeigie, CzechRad is not assembled from several commercial modules but instead uses brand new custom designed boards - mainboard using SAMD21G processor (ARM M0+), GPS module by uBlox. The electronic boards will be manufactured by Tesla (Czechoslovak company). While bGeigie Nano uses OLED display in inverse mode (white text on black), the CzechRad has standard monochrome LCD display, which is better readable in daylight.

  • CzechRad pre-production prototype with closed case CzechRad pre-production prototype with closed case
  • CzechRad pre-production prototype opened CzechRad pre-production prototype opened

References

  1. deutschlandfunk.de, Forschung aktuell, 29. Dezember 2016, Dagmar Röhrlich: Von der Hausfrau bis zum Strahlenexperten (30. Dezember 2016)
  2. Microsoft UK (2018-01-22), Haiyan Zhang - Microsoft Innovation, retrieved 2018-02-25
  3. Brown, Azby (6 June 2016). "Safecast: successful citizen-science for radiation measurement and communication after Fukushima". Journal of Radiological Protection. 36 (2): S82–S101. Bibcode:2016JRP....36S..82B. doi:10.1088/0952-4746/36/2/S82. PMID 27270965.
  4. Bossew, Peter; Kuča, Petr; Helebrant, Jan (December 2020). "Mean ambient dose rate in various cities, inferred from Safecast data". Journal of Environmental Radioactivity. 225: 106363. Bibcode:2020JEnvR.22506363B. doi:10.1016/j.jenvrad.2020.106363. PMID 33120027. S2CID 226206056.
  5. https://fabcafe.com/events/tokyo/read-the-air-with-safecast - “Read the Air”: Introducing the Most-Easy-to-Use Air Quality Monitor Ever Built! The Airnote with Safecast
  6. https://m5stack.com - M5Stack
  7. http://irnas.eu/other%20projects/2015/06/07/safecast-slovenia Archived 2018-04-22 at the Wayback Machine - Radiation monitoring of Slovenia with Safecast
  8. https://safecast.org/2022/07/announcing-bgeigies-for-ukraine/ Archived 2022-12-17 at the Wayback Machine - Announcing “bGeigies for Ukraine”
  9. https://twitter.com/SUJBofficial/status/1534130318915129344 - Státní úřad pro jadernou bezpečnost: "Náš“ Státní ústav radiační ochrany poskytl Ukrajině 10 detektorů...
  10. https://safecast.org/2022/09/over-300000-data-points-gathered-by-bgeigies4ukraine/ Archived 2022-12-17 at the Wayback Machine - Over 300,000 data points gathered by #bgeigies4ukraine !
  11. https://map.safecast.org/?logids=qbgeigies4ukraine - #bgeigies4ukraine data in Safecast Map
  12. https://github.com/juhele/CzechRad - CzechRad

External links

  • Official website
  • bGeigie Nano radiation detector homepage
  • Brown, Azby; Baumont Genevieve; Kuča, Petr; Helebrant, Jan - Citizen-based radiation measurement in Europe: Supporting informed decisions regarding radiation exposure for emergencies as well as in daily life. RICOMET2016 Conference poster. Available online as PDF.
  • Brown, Azby; Franken, Pieter; Bonner, Sean; Dolezal, Nick; Moross, Joe - Safecast: successful citizen-science for radiation measurement and communication after Fukushima - Published 6 June 2016 • © 2016 IOP Publishing Ltd Journal of Radiological Protection, Volume 36, Number 2, available online.
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