Medi, the beam shields are glitches that follow on from the Power Bomb/Beam Techs.

Charge up the spazer, use the power bomb, then switch to another one for the spazer shield, I think that's how it works anyway.

Anyway, question question...

Bosses and Mini-Bosses aside, name all the one-time scans in Metroid Prime 2 and ONLY one time scans, things that appear in more than one room in the game are not counted, single opportunity scans only.