Any one know the tittle of this movie?

The movie goes like this. In the movie there was this married couple who lived in Los Angeles and one day the city was hit with nuclear radiation. The Government was telling the citizens to stay in there homes and board up the windows aslo sealing anything that allowed air from outside in. Husband comes home doesnt find wife but hears about the government warnings. He seals up the house and waits for his wife. When Wife returns he wont let her in because she could expose him to radiation. POINT OF THE STORY is that the people who actually sealed themselves in there homes hoping of not dieing from radiation were actually the ones who were sealed in a home that was full of radioactive air.