Re: Pipes & ducts, surveys of

[Daniel Montgomery <danmon@mindspring.com>]

At 01:00 PM 8/11/95 -0500, you wrote:
>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
>
>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?
>
>Our company, Analytics Inc., has made numerous radionuclide standard
sources for calibrating instruments used for checking contamination levels
of gamma-ray emitters in piping.  The source are rectangular planar sources
with one side equal to the inside circumference of the pipe and the other
side adjusted depending on the field of view of the instrument used.  These
sources can then be inserted in a pipe of the same dimensions to be
monitored and measured with the instrument of choice to determine the
detection efficiency. The radionuclide(s) can be specified depending on
expected contamination.  The sources can also be made at activities
corresponding to or slightly greater that required sensitivity levels. This
allows you to demonstrate that required sensitivities are met.

If you desire more info, get in touch with me at danmon@mindspring.com

Dan Montgomery (Dr. Doom)