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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
TEPCO has been caught doctoring the readings and downplay the impact of Fukushima by ordering workers at the cleanup sites “to shield their dosimeter with lead covers to make the integral dose look lower than actual.â€
Workers confirmed that “they covered the dosimeters with lead cases.â€
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Ash Small wrote ...
TEPCO has been caught doctoring the readings and downplay the impact of Fukushima by ordering workers at the cleanup sites “to shield their dosimeter with lead covers to make the integral dose look lower than actual.â€
Workers confirmed that “they covered the dosimeters with lead cases.â€
It's hard to know what to make of this. The 'lead covers' could be alpha-beta filters, so the instruments recorded gamma only.
Workers confirmed that “they covered the dosimeters with lead cases.â€
It's hard to know what to make of this. The 'lead covers' could be alpha-beta filters, so the instruments recorded gamma only.
If you'd want to just block betas, a lighter material than lead would be just as effective and weigh less. A lighter material would also not block gammas as much, providing a more accurate reading. Particularly low energy gammas are blocked well even by thin layers of lead. Also there is the question, why betas should not be recorded. They are just as harmful to humans as gammas.
During my work at an accelerator lab I never carried a lead shielded dosimeter or even heard of anyone carrying one.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Uspring wrote ...
Workers confirmed that “they covered the dosimeters with lead cases.â€
It's hard to know what to make of this. The 'lead covers' could be alpha-beta filters, so the instruments recorded gamma only.
If you'd want to just block betas, a lighter material than lead would be just as effective and weigh less. A lighter material would also not block gammas as much, providing a more accurate reading. Particularly low energy gammas are blocked well even by thin layers of lead. Also there is the question, why betas should not be recorded. They are just as harmful to humans as gammas.
During my work at an accelerator lab I never carried a lead shielded dosimeter or even heard of anyone carrying one.
Some dosimeters do come with optional filters. The reason for using them in this case is to conceal the magnitude of the hazard from workers.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Having read the above comments regarding alpha, beta and gamma radiation, I decided to google 'Fukushima neutron' as no-one yet seems to have mentioned neutron beams and Fukushima in the same post.
First thing I found was this:
Wikipedia also reports 'By March 23, 2011, neutron beams had already been observed 13 times at the crippled Fukushima nuclear power plant.'
More results here:
(I've not yet read this stuff in depth, but thought I'd 'put it out there' anyway)
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Fukushima
