radium a造句

• All uraninite minerals contain a small amount of radium as a radioactive decay product of uranium.
• Some of radium-226's decay products received historical names including " radium ", ranging from radium A to radium G.
• Carnotite was suspected to contain radium as early as 1903, on the basis of the anomalously high radioactivity of carnotite ores.
• A common reason that radium was added into almost everything at the time, including water and toys, was that people saw radium as fun, not harmful.
• Rutherford assumed that the rate of decay of radium as determined by Ramsay and Soddy was accurate, and that helium did not escape from the sample over time.
• In 1914 he was appointed Attending Surgeon and Chief of the Radium Department at Memorial Hospital, New York City, where he developed and advanced the use of radium as a therapeutic agent.
• In 1940, the Swiss chemist Walter Minder announced the discovery of element 85 as the beta decay product of radium A ( polonium-218 ), choosing the name " helvetium " ( from, " Switzerland " ).
• Research he did at MIT enabled him in 1941 to establish one 10-millionth of a gram of radium as the " maximum permissible body burden, " or the maximum amount acceptable without the likelihood of bodily damage.
• He was the first man in this country to advocate radium as the agent of choice in cervical carcinoma; the technique of burying radium emanation in the cervix was original with him and, in fact, all his work with radium emanation needles was primarily original.
• He then showed the difference between atmospheric ( sound ) waves and ether waves ( heat, light, and electrical ), and alluded to the emanations given off by radium as consisting of electrons negatively charged, and also much larger particles of matter termed ions positively charged.
• In 1941 this research enabled Professor Evans to establish one ten-millionth of a gram ( 0.01 ?Ci ) of radium as the " maximum permissible body burden "-the greatest quantity of a radioactive substance that the human body can tolerate without a likelihood of damage, allowing a large margin for safety.