Chapter 5: Using the Protector Radioisotope
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Original instructions
Final Purging
Upon completion of work, the hood should be allowed to operate for two to
three minutes undisturbed, to purge airborne contaminants from the work
area before shutting down blower.
Unloading Materials and Equipment
Objects in contact with contaminated material should be surface
decontaminated before removal from the hood.
All open trays or containers should be covered before being removed from
the hood.
Final Decontamination
Water washdown or flooding the surfaces with water is standard practice
and results in about 50% reduction of contamination on the 304 stainless
steel liner material due to radiochemicals.
A secondary means of surface decontamination involves the use of organic
solvents that can result in up to 75% reduction of contamination due to
radiochemicals.
Even though 304 stainless steel seams are smooth to the touch, there are
microscopic voids within the surface in which radioactive particles can
lodge and are not easily removed except by abrasion decontamination.
Abrasion decontamination consists of sanding and/or scouring operations
to dislodge radioactive particles from the stainless steel hood liner.
Shutdown
Only turn off the light and hood blower if final washdown is complete, and
then close the sash.
