Subject: Would several slim blocks of concrete block gamma radiation?

Suppose you had twelve walls of concrete 1 cm thick and each of these walls 
were separate from one another by one metre one after the other. Suppose 
further that you have a gamma radiation emitter at one end of this line of 
walls and a gamma-ray monitor of some sorts at the end. Now, as the combined 
thickness of the concrete would block most/all of the radiation (6 cm would 
block half so 12 would presumably block most of it) if united into one 12 cm 
thick wall, would the separate walls with combined thickness also block all the 
radiation? Or would the radiation move uninhibited through each with limited 
loss from the distance. Let's assume the space between each wall has no 
atmosphere that would greatly absorb the rays. 

Re: Would several slim blocks of concrete block gamma radiation?