Radiation damage seems quite impressive.
This would seem to imply that a vehicle fusion gun (3D D damage) does 400-2400 rads within 300 metres per shot. Ouch! Since a starship only provides 500 rads protection this suggests the firing crew would be toast within a couple of shots. Even a battledress equipped marine would likely be killed instantly if within 300 metres of the line of fire.Radiation: When a Radiation weapon is fired, anyone close to the firer, target and the line of fire in-between the two will receive 2D x 20 rads, multiplied by 10 for Vehicle scale weapons and 100 for Spacecraft scale weapons. This effect extends from the firer, target and line of fire a distance in metres of ten times the number of dice the weapon rolls for damage. If the fusion weapon is Destructive, this distance becomes a hundred times the number of dice rolled for damage.