Cobalt 58 was detected in Gunma, half-life is 71days, “Possibile recriticality around after April”

Cobalt 58 was detected in Gunma, half-life is 71days, "Possibile recriticality around after April"


Cobalt 58 was detected from the black substance in Gunma. (cf. Black substance found at Harajuku station in Tokyo, “21,346 Bq/Kg”)

Co-58 is produced from neutron ray, the half-life is only 71 days.

The video was taken by Mr. Sakagami, an engineer of radiation measurement equipment.

It was caught on the video by portable spectrum of Bicron, but he added this comment that he always saw the “peak” on the spectrum by other instruments.

Cs-137 was also detected in addition to Co-58.

About this measurement of Co-58, Mr. Sakagami also commented like this on 7/24/2012,

コバルト58の半減期は 70日ですよね

それが 先月見つかったのは 福島の第一は 数ヶ月前に 臨界で危険な状態になっていた 証拠です



The half-life of Co-58 is about 70 days. I measured it last month, which means Fukushima plant was having recriticality a few months ago.



↓ The video  2:46~


<Settlement report 8/30 ~31>

This is the space to show how much donation I received since yesterday.

Thank you very much for your support. Now I’m writing this in Toronto. I arrived at here after mid night yesterday and now I have to go out to pick up something to eat. I ‘ll sleep early because tomorrow is the day to go to NY finally. I’m almost pissing myself though I didn’t do anything wrong.

The smell of cars, smoke, food and sweat reminded me of Tokyo / Yokohama. Maybe it’s the most comfortable city so far, but everything is expensive as crazy. I noticed some cashers even make mistake to give me back change (or spontaneously deducting a tip / thank you for your cooperation). but I shouldn’t be complaining, NY would be much more,, I’m hoping for a safe trip. Good evening.

Settlement report 8/30 ~31

Settlement report 8/30 ~31

Settlement report 8/30 ~31 3


Français :

Du cobalt 58 détecté à Gunma, sa demie-vie est de 71 jours, “possible retour de criticité vers après fin avril”

Cobalt 58 was detected in Gunma, half-life is 71days, "Possibile recriticality around after April"


Du cobalt 58 a été détecté dans de la substance noire dans  Gunma. (cf. De la substance noire trouvée à la gare de Harajuku dans Tokyo, “21 346 Bq/kg”)

Le Co 58 est issu de rayonnements à neutrons, sa demie-vie est de 71 jours seulement.

La vidéo a été faite par M. Sakagami, un ingénieur en matériels de détection de la radioactivité.

Sur sa vidéo, il a filmé un portable spectrum de marque Bicron mais il dit dans son commentaire qu’il a toujours eu le même pic avec ses autres instruments.

Du Cs-137 a aussi été détecté en plus du Co-58.

Sur sa mesure du Co-58, M. Sakagami a aussi dit ceci le 24 juillet 2012,

コバルト58の半減期は 70日ですよね
それが 先月見つかったのは 福島の第一は 数ヶ月前に 臨界で危険な状態になっていた 証拠です


La demie-vie du Co-58 est d’environ 70 jours. J’ai pu en mesurer le mois dernier. Ceci signifie que l’usine de Fukushima a connu un retour de criticité il y a quelques mois.


↓ La video 2:46~



<Rapport financier des 30 et 31 août 2012>

Voici l’espace réservé à combien j’ai reçu de dons depuis hier.

Merci beaucoup de votre soutien. J’écris ceci de Toronto. Je suis arrivé ici après minuit hier et maintenant je vais sortir trouver quelque chose à manger. Je vais me coucher tôt parce que demain est le jour où je me rends enfin à NY.  Je crève de trouille bien que je n’ai commis aucune erreur.

L’odeur des voitures, la fumée, la nourriture et la transpiration me rappellent Tokyo / Yokohama. C’est sans doute une ville très agréable mais tout y est effroyablement cher. J’ai même vu des caissiers se tromper en me rendant la monnaie (ou retirant d’eux-mêmes un pourboire / merci pour votre coopération).  mais je ne dois pas me plaindre, NY devrait être bien pire, j’espère faire un bon voyage. Bonne soirée.

Settlement report 8/30 ~31

Settlement report 8/30 ~31

Settlement report 8/30 ~31 3

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.