If possible solder them on. Done right it will be the strongest and least likely to leak.
In a pinch or when "Jerry Rigging" PVC to metal I have used JB weld. I'm not sure how long JB Weld will wrok constantly exposed to water.
I'm not sure why you would need to add barbs to a radiator, most come with some type of barb.
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CPU: Barton2500 @ 2.43 ghz
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