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To: fella

Correct unit would be R/hr.

This common radiography source travels from a shielded storage “container” via a crank and screw mechanism through a tube to expose a weld or other metal for inspection via image on developed film or more modern digital media.

Size of the source is small as described to travel through the tube of hte radiography camera. Because of its size, it behaves like a “point source”, i.e. dose rates fall off significantly with the square of the increasing distance.

A 100 R/hr dose rate at 1 cm from source would be <100 mR/hr at 1 meter distance and on the order of 10 mR/hr at 3 meters. Something to worry about if it was in your pocket or imbedded in you after a dirty bomb explosion but not a big deal if it was unshielded across the room from you for a while.

Commenters Right on the half life considerations, terrorists would have to move relatively fast or there is nothing but a non-radioactive BB left.


20 posted on 02/17/2016 11:57:13 AM PST by spiderpig (does whatever a SpiderPig does)
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To: spiderpig

A Ir-192 source can and has been used a murder weapon, they have also been involved in some horrible accidental exposures. All that’s needed is to have the unshielded source placed near to the victims for an extended time. Radiation can not be detected by our senses and the victim knows nothing until they are sick with radiation poisoning and then it’s usually to late.


23 posted on 02/17/2016 4:51:28 PM PST by fella ("As it was before Noah so shall it be again,")
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