Experimental Research After an extensive literature review, there are only a handful of academic studies that investigate the radiation attenuation phenomenon with experimental research. These studies look at a wide range of water sprays: large droplets, fine mists, fan nozzles, hollow cone, and full cone sprays. Reischl [28] investigated firefighter protection from radiation by using firefighter nozzle sprays as a shield. This project used three different types of firefighting fog nozzles at different spray angles (30º, 60º, and 90º) which operated at two different flow rates (85 and 95 gal/min, or 321.8 and 359.6 L/min respectively). The radiant heat source was a large liquid propane fire with a reflective shield behind it to increase the radiation towards the testing equipment. The nozzles were mounted to a platform with a radiometer attached behind the nozzle at the firefighter position. It was found that the 90º spray was the most effective at attenuating the radiation at ≈13%. Both the 60º and 90º sprays were capable of protecting three to four firefighters, but the 30º spray was found to only be able to protect one fireman. These results provide a good baseline of what large droplet water sprays are capable of attenuating,