Re: Pipes & ducts, surveys of

[gmasters@csn.net (Gary Masters)]

>Whew, its been a long week. But, its Friday!
>
>Esteemed Radsafers, a few questions regarding surveys of the
>interiors, not exterior, of pipes and ducts:
>
>1. What instruments, commercially available or otherwise, have you
>used? Any comments, good or bad?
>
>2. If it was done quantitatively, how did you determine the
>efficiencies?
>
>3. Any general thoughts on this subject e.g. problems, good
>references etc?
>
>Thanks
>
>Paul Frame
>

We've done alot of duct remediation at RFETS, but I'm not sure if we ever
performed surveys internally. I know that I was consulted regarding detector
types for that purpose, but don't recall any feedback. As I recall the
detectors were to be mounted on a pipe crawler (robot). I'll check into it
and get back to you. It would help to know what you are trying to detect. We
were hunting for alpha emitters.

I do know that our D&D technology group developed some nifty pipe crawlers,
including the 'robohemien' which was able to shift it's center of gravity
such that it was able to climb over the butterfly-valve seats in the ductwork
while still fitting between the seat and gate of an 8" butterfly-valve. We
showed video of it at the SRS ALARA week a couple years ago.


>Bonus question. Does anyone know anything about a navy(?)
>radiation(?) symbol that takes the form of a trident with a wavy line
>(gamma ray?) heading off at right angles from one of the prongs?
>

This sounds alot like the Navy rating symbol for an Ocean Systems Technician.
I believe the "wavy line" represented a sound wave traveling through the water.
Basically they were 'ocean snoopers'.

Gary Masters
gmasters@csn.net