RE: Helicopter IBIS and Sr-90 sources

[John Jacobus <crispy_bird@YAHOO.COM>]

Sounds good.  I believe the blades are under pressure

to give them the desired shape.  If the air escapes

from the blades through a crack, the Y-90 goes with

it.  

 

--- "Neil, David M" <neildm@id.doe.gov> wrote:

> I'm making a SWAG here, but my guess is that the

> Sr90 is shielded and used as a generator for Y90

> which is circulated in the blades.  This escapes

> through any stress cracks that might occur and is

> detected warning the pilot of impending failure of

> the blade.

> 

> Blade failure while aloft in a rotary wing craft is

> considered a Real Bad Thing by pilots.

> 

> -----Original Message-----

> From: Brian Rees [mailto:brees@LANL.GOV]

> Sent: Wednesday, May 19, 2004 9:53 AM

> To: radsafe@list.vanderbilt.edu

> Subject: Helicopter IBIS and Sr-90 sources 

> 

> 

> Can someone 'splain this to me??? I don't quite

> understand how this works, 

> a report references a shielded container, so I'm

> kinda confused (not 

> terribly unusual).

> 

> "The strontium-90 was part of the helicopter's

> in-flight blade inspection 

> systems (IBIS), which warn

> pilots when the blades develop stress fractures.

> IBIS devices release 

> minute amounts of radiation

> when a leak develops in the pressurized blades, and

> a radiation detector on 

> each wing immediately

> notifies the pilot that a blade may fail."

> 

> Thanks in advance,

> Brian Rees 

> 

>

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=====

+++++++++++++++++++

"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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