Fukushima Diary reported the radiation level in Nasu town hall drops at 8AM of everyday except for Sunday.[URL]
According to MEXT, it still drops down on the regular basis.
In the last post, there were some comments that it might be because of the traffic or hall town staff come to the office, but this is the only monitoring post to indicate the regular drops of radiation level though none of the other posts in town / city hall indicates this obvious regular drops, where also have traffic and staff to come to work.
http://radioactivity.mext.go.jp/map/ja/area2.html
Iori Mochizuki
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Français :
Le niveau de radioactivité surveillé dans la mairie de Nasu dans Tochigi redescend tous les jours à 08:00
Le Fukushima Diary avait rapporté que le niveau de radioactivité surveillé dans la mairie de Nasu redescendait tous les jours à 08:00 sauf le dimanche.[Lien]
Selon le MEXT, il continue de descendre sur cette base régulière.
Dans le dernier sujet, il y a eu des commentaires disant que ce pourrait être dû au trafic ou aux entrées du personnel de la mairie arrivant au travail mais c’est la seule borne à indiquer cette chute régulière de la radioactivité, contrairement à toutes les autres bornes situées dans la mairie alors qu’elles subissent les mêmes variations de trafic et de gens arrivant au travail.
http://radioactivity.mext.go.jp/map/ja/area2.html
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One of the things I can think of is Radon gas.
If someone keeps an open door, or the mechanical ventilation inside the building is turned up, the radiation goes down too.
Radon gass is something that occurs naturally from the walls of concrete buildings etc.
Looking closely to the graph it appears that the radiation drop is slow , it takes 2 to 3 hours to bottom .
Than it stays for some 10 hours before slowly goes up .
…
A : are the people that fill up the building acting as Filters by breathing in the radiation and exaling ‘cleaner’ air ?
…
Where is the video survailance tape + is the building open to the public on Saturdays too ? What are the hours the building is open to public , past 7 pm ? Where is Sherlock Holmes ??
One theory, there being a nuclear power plant 40 miles away, maybe check the time the morning shift starts work at the power plant what routine they take e.g turning the vents on and off (if this even occurs)…
Then theres the wind to consider, it can’t blow the same way each time and it would also be scattered data, its obviously something close by, a work place almost certainly due to the flat line sundays, is there a hospital close by…?
what kind of nuclides are detected when they are detected?
It could just be a case of the building that this data is collected from has its own venting system being turned on and off? Idk just some thoughts.
… right , by now the filters in the ventilation are surely radioactive and a Steady source of radiation except at night when turned off .
Funny that after such a long time it seems those people are not investigating .