Japan 's food sanitation law , the temporary regulations , per kilogram of milk and dairy products , the maximum activity of radioactive iodine 100 henri becquerel , the activity of radioactive cesium 200 becquerel .
Since antoine henri becquerel , the french physicist , discovered the radioactivity of uranium in 1896 , scientists in different countries have dedicated to the exploitation and utilization of nuclear energy . The first man-made nuclear reactor was run in 1942 , which means the human being stepped into the nuclear age .
Becquerel handed the phenomenon off to his student marie curie and her husband pierre .
贝克勒尔把这现象交付给了他的学生玛丽居里和她的丈夫皮埃尔。
The photovoltaic effect a phenomenon allowing light-to-electricity conversion was first described by the french physicist edmond becquerel in 1839 .
光伏效应-一种把光转换成电的现象-由法国物理学家埃德蒙贝克勒尔在1839年首先提出。
The results -- including those for radioactive elements -- use a scale that runs from minus 20 to plus 20 , eschewing the becquerel or sievert units commonly used to detect exposure .
The photoelectric effect was not discovered until 1839 , when alexandre becquerel , a french physicist , observed that light could generate an electric current between two metal electrodes immersed in a conductive liquid .