What polymer shrinks during gamma irradiation?

[olesyn]

What polymer material can shrink significantly after gamma irradiation?
I will appreciate any recommendation.

 

[IRstuff]

How much, how often, how intense?

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[olesyn]

30kGy one time doze, >10% linear shrinkage or expansion, time does not really matter, may be very slow (days).

 

[IRstuff]

So, why not use one of the commercial heat shrink products?

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[olesyn]

Does it shrink without heating?