This technical briefing summarizes radiological data from Japan following the Fukushima nuclear accident. It provides gamma dose rates and airborne radionuclide concentration measurements taken in Tokyo from March 15-19. It also reports measurements of radionuclides found in foodstuffs and water from areas near the Fukushima plant, including measurements of milk from Kawamata and leafy vegetables from Ibaraki prefecture. Additionally, it includes guidelines for radionuclide levels in internationally traded foods from the CODEX ALIMENTARIUS COMMISSION.

1. Technical Briefing on theRadiological Situation in Japan 20 March 2011

2. Gamma dose rates (microSievert per hour)

3. Data source location for nuclide-specific measurements

4. Airborne concentration in Tokyo 15-19 March 2011, Bq/m3 http://www.sangyo-rodo.metro.tokyo.jp/whats-new/measurement.html

5. Airborne concentrations Average air concentration, 15-19 March, Bq/m3 ***http://www.jcac.or.jp/lib/senryo_lib/taiki_kouka.pdf *KEK | High energy accelerator research organization **http://www.sangyo-rodo.metro.tokyo.jp/whats-new/measurement.html

6. Radionuclides in foodstuffs and water, reported byJapanese Ministry of Health and Well-fare 6 City of Kawamata, 46 km to Fukushima power plant 3 Measurements in milk

7. Radionuclides in foodstuffs and water, reported byJapanese Ministry of Health and Well-fare 7 Ibaraki prefecture 3 measurements in leafy vegetables

8. Radionuclides in foodstuffs and water, reported byJapanese Ministry of Health and Well-fare 8 46 Measurements in drinking water

9. JOINT FAO/WHO CODEX ALIMENTARIUS COMMISSION GUIDELINE LEVELS FOR RADIONUCLIDES IN FOODS TRADED INTERNATIONALLY (CODEX STANDARD 193-1995) www.codexalimentarius.net * When intended for use as such. ** This represents the value for organically bound sulphur. *** This represents the value for organically bound tritium. Scope: The Guideline Levels apply to radionuclides contained in foods destined for human consumption and traded internationally, which have been contaminated following a nuclear or radiological emergency. These guideline levels apply to food after reconstitution or as prepared for consumption, i.e., not to dried or concentrated foods, and are based on an intervention exemption level of 1 mSv in a year.

10. Exposure pathways 10

11. The transfer of radionuclides to plants 1Deposition on leaves and fruit (if fruits are present) 2 Deposition onto soil und uptake by plants through the roots 1 1 2