9T from MP, hit second pair...how do we play this?

[Fireball_AA]

$69+6 on FTP, no hand history but fairly simple and interesting given the board/action.

Blinds : 20-40.

relevant Stacks:
Hero - MP: 1,240
Vilain - BB: 1,680

Folded to Hero, raise 9 [img]/images/graemlins/club.gif[/img]T [img]/images/graemlins/club.gif[/img] to 120, folded to BB he calls.

Pot = 260

Flop : A [img]/images/graemlins/club.gif[/img]T [img]/images/graemlins/spade.gif[/img]4 [img]/images/graemlins/diamond.gif[/img]

BB checks, Hero?

Do you like to PF raise?
Why bet or why check behind?