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RE: Helicopter IBIS and Sr-90 sources
I thought that they used a Cs-137 source. Maybe they
are used on difference type of helicopters.
--- "Neil, David M" <neildm@id.doe.gov> wrote:
> Thank you. It's not at all what I thought, but
> that's what a SWAG is all about. Releasing Y90
> didn't sound right to me, but nothing else occurred
> to mind.
>
> For those of you who don't want to wade through the
> technical terms, the pressure in the blades holds
> the source retracted, then when the pressure fails,
> the spring moves it to an exposed position, where it
> can be detected.
>
> This allows qualitative monitoring of the pressure
> without the need of rotating couplings, either
> pneumatic or electrical.
>
> Right?
>
> Dave Neil
>
> -----Original Message-----
> From: Rick Orthen [mailto:rorthen@cecinc.com]
> Sent: Wednesday, May 19, 2004 1:07 PM
> To: 'Brian Rees'; radsafe@list.vanderbilt.edu
> Subject: RE: Helicopter IBIS and Sr-90 sources
>
>
>
> The IBIS is manufactured by, and registered to,
> General Nucleonics, Inc. (Pomona, CA) under
> California Registration No. CA321D103G (see
>
http://www.hsrd.ornl.gov/nrc/sources/pdf/03210103.pdf).
> The registered limit is 500 microcuries Sr-90.
>
>
>
> DEVICE TYPE: Helicopter Blade Failure Detection
> Gauge
>
>
>
> DESCRIPTION: The device consists of a cylindrical
> housing typically 5.1" long and 2.75" diameter which
> contains a bellows, a system of radial detents for
> the bellows assembly and an axial rod which houses
> the activity in the form of an Isotope Products
> Laboratory or Amersham Model GNI 12205 Annular Beta
> source. The distal end of the axial rod terminates
> in a coaxial disc and the proximal end terminates in
> a connector attached to the bellows. The distal end
> of the housing terminates in a steel reset button.
> The proximal end of the housing terminates in a base
> which attaches to the port of a helicopter rotor
> blade and exposes the proximal end of the housing to
> the pressurized center of the rotor blade. The
> interior of the bellows is sealed and maintained at
> a reference pressure. The bellows is spring loaded
> against the detents. In operation, the bellows is
> held compressed against the detents by the
> differential between the blade pressure and
> reference pressure. When the bellows is compressed
> the source rod is in a retracted position and is
> shielded by the housing. If blade pressure fails,
> the reference pressure in the bellows is no longer
> sufficient to hold the bellows against the spring.
> The spring acts to release the detents and the
> source rod is moved towards the distal end, exposing
> the source outside the shield. In this position, a
> Geiger-Mueller Detector mounted inside the upper
> fuselage senses the increased radiation field and
> signals a pressure failure to the cockpit display.
> In all detectors (GNI Model 122XX-1) a 0.01
> microcurie Strontium-90 source is incorporated to
> provide a bias signal for fail safe
>
> operation.
>
>
>
>
>
> Richard F. Orthen, CHMM
>
> Senior Project Manager
>
> Civil & Environmental Consultants, Inc.
>
> Four Triangle Lane, Suite 200
>
> Export, PA 15632-9255
>
> 724/327-5200, ext. 231
>
> www.cecinc.com <http://www.cecinc.com/>
>
>
>
>
=====
+++++++++++++++++++
"We cannot escape danger, or the fear of danger, by crawling into bed and pulling the covers over our heads."
-- Franklin Delano Roosevelt
-- John
John Jacobus, MS
Certified Health Physicist
e-mail: crispy_bird@yahoo.com
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