Yes, ACTINAL is a Scrabble word!

Letter values in Scrabble US: A 1, C 3, T 1, I 1, N 1, A 1, L 1.

Is it a valid word?

ACTINAL is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(of radiate organisms) located on the surface or end on which the mouth is situated