Inspection with an optical microscope

1. All features that appeared in lines are in the direction of the wire spiral.

Stone kapton straw

Stone kapton straw that was never used.

Stone kapton straw that was irradiated.

Stone kapton straw, used for 3 years.

Although it appears the the straw that was irradiated shows more holes - It appears to me that it depends more on the piece of straw (chance) than irradiation (as this effect is not seen in the Lamina-thin straw).

Lamina thin straw

Lamina-thin straw that was never used.

Lamina thin straw that was irradiated.

No extra holes after irradiation are observed.