[ RadSafe ] Accelerator safety system suggestions
Ted de Castro
tdc at xrayted.com
Fri Mar 17 22:08:11 CDT 2017
Check with HPI (Health Physics Instruments Goleta, CA)
Argonne has an ion chamber area monitor they use in their accelerator
area they LBL copied from them - with a few improvements - and then we
got HPI to make them for us - with a few more improvements - like
communication. NO Argonne gets them from HPI too. Its tailored to low
energy BUT HPI is a near custom shop and could most likely put on an ion
chamber without as low and energy response - but more robust and easier
and cheaper to make. They also have a pressurized ion chamber survey
meter in their product line and I'd bet they could put THAT ion chamber
on the area monitor. They also have a GM area monitor - but the IC
would be more accurate.
As for neutron - I don't know of anything off the shelf but again HPI
has a high energy Andersson Braun moderated survey meter that could
probably easily be converted to area monitor -for your case of course
the normal Andersson Braun moderator BUT if you don't need true DOSE
indication - there are many sorts of easier and cheaper moderators that
could be used. I THINK they also have a tissue equivalent ion chamber
that would be sensitive to both neutrons and photons --- but not
indicate which it detected. There are lots of possibilities with a small
run shop that already has most of the basics there - just switching
detectors and front end electronics.
The trade off is that lead time may be an issue - but they always came
through for me when I worked at LBNL.
Most other area monitors I've seen are either GM or Scintillator and
more suited for an isotope lab environment.
BTW - All HPI units I had experience also seem to tolerate the high
electrical noise of an accelerator quite well.
Its worth the call.
NO - I'm not a stock holder or partner or any such thing - just a long
Ted de Castro
On 3/17/2017 7:08 PM, Carl Willis wrote:
> Hello RADSAFErs,
> I'm working on a fast-moving project involving a 14-MeV proton linac
> facility for which we will be building a radiation safety system per
> ANSI/HPS N43.1. No plan exists yet for the configuration of the system,
> but it will involve some active radiation monitors, for photons and
> neutrons within the shielded area and for photons outside, all interfaced
> with a LabVIEW control unit.
> I would love some suggestions for specific detector and control system
> hardware that others have used and can recommend. Please let me know if
> you have favorite vendors or other suggestions!
> Carl Willis
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