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at nasa's kennedy space center in

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florida technicians in the vehicle

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assembly building make additional

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imaging scans of space shuttle

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discovery's external fuel tank

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on december 29th technicians scanned

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below the external tank's foam

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insulation around the entire entertain

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section to look for any issues like

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cracks

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workers using computed radiography

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scanners that work like an x-ray machine

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by transmitting radiation through the

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tank's foam and metal skin

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the scans will help verify repairs

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associated with cracks on tops of two 21

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foot long u-shaped aluminum brackets

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called stringers which line the

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intertank and help engineers determine

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what caused the cracks during

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discovery's launch attempt on november

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5th managers and engineers will review

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the test data to determine the next

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course of action discovery's next launch

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opportunity for its sts-133 mission to

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the international space station is no

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earlier than february 3rd

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voltage cable

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ground cable and coolant lines

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so the control unit upstairs

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sends whatever

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kill voltage we need in amperage

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and there's a filament here that heats

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emits electrons

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those electrons are streamed to a target

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this is the image plate

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uh it takes place of the old film

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techniques

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and this sheet right here is the lead

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backing for a backscatter

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to prevent backscatter x-rays from

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changing any of the image patterns but

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all this is enclosed up there in a dark

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and then we seal it and it's ready for

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gonna go in

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and this is the film holder

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that will

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i position on on these stringer

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locations

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and correspond that with the x-ray

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equipment outside and that way we shoot

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the same stringer

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then to remove it just the opposite

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so