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Most of the developed countries have used their tunnels as protective structures (public nuclear shelters) in case of nuclear emergencies to protect their citizens from the dangerous effects of nuclear weapons. The research aims to explain how to use tunnels to protect some people from neutrons and gamma rays and account the required safe depth. The computer code (MCNP5) is used at this model for such tunnel to account attenuation of both neutrons and gamma rays passing through the canal water, sand, soil and reinforced concrete wall layers. The last one (thickness 105 cm) constructed the tunnel construction. Also, the computer code is used to account the dose inside the tunnel, and account (neutron) dose, (neutron, gamma) dose, prompt (gamma) dose, total (gamma) dose and total (neutron + gamma) dose estimated by μsv/h, at different depths from the water surface level (depths 200 cm, 500 cm, 1,000 cm, 1,600 cm, 2,200 cm, 2,600 cm, 2,800 cm, 3,400 cm, 3,700 cm, 4,000 cm and 4,600 cm). Then, account these doses for three bombs (its intensity 20 KT, 100 KT and 1,000 KT).

Calculations of Radiations Attenuation and Dose Assessments of Tunnels Passing under Water Canals