Scotch Tape -vs- Kapton tape=

A 20 MeV electron was used to make a bremsstrahlung beam that impinged a sample of regular Scotch Tape and Kapton tape. Both tapes had similar areas of 2.5 x 3 cm. The Kapton had twice as much mass as the Scotch (0.1247 g -vs 0.0699 g).

The scotch taper became brittle after 4 hours of irradiation on the 25 N machine.

Below is an uncalibrated spectrum using Thorium rods. Lines should appear at 2614 and