Cs-134/137 measured from 92 of 92 swallow nests in Fukushima / Highest density was 90,000 Bq/kg

On 5/22/2015, Yamashina Institute for Ornithology reported that they detected Cesium-134/137 from 92 of 92 swallow nests in Fukushima.

Overall, Cs-134/137 was measured from 150 of 182 swallow nests collected in 12 prefectures and Tokyo to include all the prefectures in Kanto, North East, North West coast and Mid Japan area except Tochigi.

The highest reading was 90,000 Bq/Kg in Fukushima. They measured Cs-134/137 even from the sample collected in Shizuoka prefecture.


This research was implemented by Yamashina Institute for Ornithology and National Institute for Environmental Studies. The samples were collected from 2011 to 2012.

It is stated in the report that the Cs-134/137 density of a nest is in proportion to the soil contamination level of the surrounding area, the reproductive performance needs to be reviewed. However, they concluded that the Cs-134/137 density of the swallow nests is not high enough to give an immediate effect to human health.


Related to this article.. Breeding success of goshawk significantly dropping in North Kanto area / 0.1 μSv/h increase reduces 10% breeding [URL]





Français :

Du Cs 134/137 dans 92 sur 92 nids d’hirondelles de Fukushima / Record de 90 000 Bq/kg


Le 22 mai 2015, le Yamashina Institute for Ornithology a annoncé avoir relevé du césium-134/137 dans 92 nids d’hirondelles de Fukushima, sur 92.

Au total, le Cs 134/137 a été relevé dans 150 des 182 nids d’hirondelles échantillonnés dans 12 préfectures et Tokyo dont toutes les préfectures de Kanto, du Nord Est, de la côte Nord Ouest et du centre du Japon hormis Tochigi.

Le record relevé est de 90 000 Bq/kg. Ils en ont même relevé dans l’échantillon provenant de la préfecture de Shizuoka.

Cette recherche a été menée par le Yamashina Institute for Ornithology et le National Institute for Environmental Studies. Les échantillons ont été collectés en 2011 et 2012.
Le rapport affirme que la radioactivité en Cs 134/137 d’un nid est proportionnelle à celle du sol environnant, l’efficacité reproductive doit encore être réexaminée. Ils en concluent néanmoins que la radioactivité en Cs 134/137 des nids d’hirondelles n’est pas assez forte pour avoir un effet immédiat sur la santé humaine.

Article lié : Au nord de Kanto la reproduction de l’autour des palombes se réduit de 10 % à chaque 0,1 μSv/h ajouté


About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


May 2015