Polish authorities released the cockpit transcript hoping to quiet persistent speculation about the April crash that killed much of Poland’s government. Tupolev During World War II, the twin-engined, all-metal Tu-2 was one of the best front-line bombers of the Soviets. Several variants of it were produced in large numbers from 1942. During the war it [...]
Posts tagged ‘metal’
Tupolev
May 5th, 2011
Radiation
March 16th, 2011
Beta-minus (β−) radiation consists of an energetic electron. It is more ionizing than alpha radiation, but less than gamma. The electrons can often be stopped with a few centimeters of metal. It occurs when a neutron decays into a proton in a nucleus, releasing the beta particle and an antineutrino. Radiation Proton therapy: External-beam radiation [...]