RE: Helicopter IBIS and Sr-90 sources

["Erickson, John (DDDC)" <John.Erickson@dla.mil>]

the ibis is simply a dp cell; the plunger that activates has an attached

500mCi strip of sr90 on it; when the dp cell activates, the plunger pops up

and an istalled detector activates an alarm.  we store the devices for the

navy; i am not attached to a helicopter squadron.  my understanding is that

the blades are pressurized and a rupture of the blade causes the dp cell to

activate.

the only shielding is a plastic housing that goes over the ibis when not in

use to prevent beta exposure.  



john erickson

defense depot



-----Original Message-----

From: owner-radsafe@list.vanderbilt.edu

[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of Brian Rees

Sent: Wednesday, May 19, 2004 8:53 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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