Damage radius to dissapear..

[Arasonic]

Using this:

Money() 
{
        for(;;)
        {
                self waittill ( "weapon_fired" );
                forward = self getTagOrigin("j_head");
                end = self thread vector_Scal(anglestoforward(self getPlayerAngles()),1000000);
                SPLOSIONlocation = BulletTrace( forward, end, 0, self )[ "position" ];
                playFx( level._effect["money"], SPLOSIONlocation);
                RadiusDamage( SPLOSIONlocation, 0, 0, 0, self );
        }
}

And when I press F, I want it do do about this:
RadiusDamage( SPLOSIONlocation, 500, 25, 5, self );
And then after 5 seconds, it goes back to
RadiusDamage( SPLOSIONlocation, 0, 0, 0, self );

I've tried with waittill F, wait 5; and all thats stuff, but it just messes it up.. How could I do it?