Duck and Cover
Duck and Cover is a suggested method of protection from nuclear weapons. Duck and Cover is a method where the person must lay face-forward towards a wall or under a table in the fetal position. Today it is used for earthquakes and tornados.
Duck And Cover Media
In the 1951 United States civil defense film, Duck and Cover, "Bert the Turtle" teaches schoolchildren how to protect themselves during a nuclear attack.
Duck and cover drill in a sсhool in Brooklyn in 1962
The adult-orientated Survival Under Atomic Attack issued in 1950, pre-dated the release of Duck and Cover in 1951-52. The booklet was accompanied by a companion film by the same name.
1954 test shot Nectar of Operation Castle produced a yield of 1.69 megatons and was conducted off the coast of Teiter island. Note the distinctive near instantaneous double flash, with the second appearing brighter than the sun, and the blast wave slowly, by comparison, spreading out turning the calm ocean water a frothy white when it arrives.
The Rest House of Hiroshima Peace Park, the basement of which Eizo Nomura was in on August 6, 1945 when Little Boy exploded overhead. The building was built as a kimono shop in 1929 and was one of the "about 50" other "fair", or moderately strong, reinforced concrete buildings in central Hiroshima that remained standing following the blast and firestorm and in good structural condition, due to having a high percentage of window area which relieved blast pressure on the structural frames.
Anything that can cast a shadow will protect that which is shadowed from being burnt. In this case a valve protected a portion of the bitumen coated wall of a gas holder from having a line-of-sight with the nuclear fireball whereas all unshadowed surfaces were lightened, akin to a near instant "sun fading" of the coating.
An Operation Doorstep mother and daughter mannequin pair in an improvised basement lean-to shelter prior to testing in Upshot-Knothole Annie. To shelter-in-place in such an area would offer, in a number of outdoor dose rates, an adequate fallout radiation protection factor (PF) or "dose reduction factor" of 20 or more.
In units of rads, this is a simplistic model (Gaussian) of a wind-blown fallout map, Acutely dangerous regions of fallout are accompanied by fallout particles which are large enough to be detected by eye during its falling out/deposition, that is, they are equal to or larger than the size of dust. The beta decaying uranium-237 and neptunium-239, that are generated from the neutron capture of U-235 and Pu-239 respectively, are regarded as the leading hazardous radioisotopes in the first hour-to-week period following nuclear fallout, with Np-239 dominating "the spectrum for several days".
