Friday, February 22, 2013

#Fukushima I Nuke Plant: Sediment Sample Collected from Flooded Torus Room of Reactor 1

Uh... They put the sediment sample in a plastic bottle?

According to TEPCO, the plastic bottle is emitting 4 millisieverts/hour radiation with the sediment in it.

From TEPCO's Photos and Videos Library, 2/22/2013:

Workers in full gear collecting samples through the hole on the first floor of the Reactor 1 building, where the air radiation dose ranges from 2 to 10 millisieverts/hour. It took 20 workers 2 hours and 35 minutes to complete the task, for which they received 1.46 millisievert (maximum) of radiation exposure.


Anonymous said...

A polyethylene bottle is an appropriate container for reducing α, β, and neutron emission. E.g., from "Neutron Interactions with Matter", P. Rinard:

"Figure 12.8 shows that a cylinder of polyethylene is more effective in preventing the transmission of neutrons than a cylinder of heavy metal. A neutron loses most of its energy by colliding with the light elements in polyethylene and then the mean-free-path length becomes small as the cross sections increase."

Darth 3.11 said...

And how much more radiation did the worker with his face uncovered receive? This photo is not reassuring.

Anonymous said...

A piece of plastic is not going to protect you from gamma radiation (nothing would apart from a full body armor made of lead). The important thing is the respirator and decontamination procedures when you finish.

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