Ghost bombs

This is purely speculation:Wenn activating the bomb you tap on the place you want it to explode, killing all ghost in a certain proximity.
The question is how big the radius of the death zone is. I believe it wont be bigger than the screan fully zoomed out.

I posted my thoughts yesterday. Since they are in the Halloween premium menu (pumpkin build icon), and that there is an option for a "box" of bombs, I see it as a one time use, and might kill all the active ghosts in your town. The vacuum gets all the ghosts on the visible screen, so it makes sense to have a detonator (especially if it's only used once). Then you can always purchase more since it's likely for X amount of donuts and you can get the box of bombs for even more donuts. The first one will be free with the community unlock.