Antoine Henri Becquerel was born in 1852, 12, 15, and came from a famous family of scholars and scientists. His father Alexander Edmund becquerel is a professor of applied physics who studies solar radiation and phosphorescence. His grandfather Anthony Seiser was a member of the Royal Society. He was the inventor of extracting metals from minerals by electrolysis. 1872 becquerel studied at Politecnico de Paris, and later graduated from the College of Roads and Bridges with the position of engineer. 1878 Professor of Physics, Paris Museum of Natural History. Becquerel married Miller Jenin, the daughter of a civil engineer. 1878, they gave birth to a son, Ji 'an, who is also a physicist, the fourth generation physicist of becquerel family. 1895 Professor of Polytechnic University. 1896 in March, becquerel discovered the photosensitive soleplate, which was put together with potassium uranyl sulfate, but wrapped in black paper and was photosensitive. He speculated that this may be because uranium salts emit some unknown radiation. In May of the same year, he found that pure uranium metal plate can also produce this kind of radiation, thus confirming the discovery of natural radioactivity. Later, the Curies called it "radioactivity". We call it natural radioactivity. Although becquerel mistook it for a special form of fluorescence at that time, the discovery of natural radioactivity was still an epoch-making event, which opened the door to the microscopic world and laid the experimental foundation for the birth and development of nuclear physics and particle physics. 1908 is dead.