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A comment on The NYPD Is Using Mobile X-Ray Vans to Spy on Unknown Targets. Parent comment

Re:The NYPD Is Using Mobile X-Ray Vans to Spy on Unknown Tar... by onnoonno on Wednesday October 21, 2015 @07:06AM (#10424679)
Again, and as others pointed out in other contexts here, it depends on the energy. Tritium has 20keV betas AFAIR. Some elements produce multi-MeV beta decay. That is not stopped by thin cardboard.
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