例句與造句

1. 89 Sr is an artificial radioisotope used in treatment of bone cancer.
2. It is an artificial radioisotope which is used in treatment of bone cancer.
3. The invention of the nuclear reactor in the Manhattan Project during World War 2 made possible the production of artificial radioisotopes for radiotherapy.
4. The invention of the nuclear reactor in the Manhattan Project during the World War II made possible the creation of artificial radioisotopes for radiotherapy.
5. A further thirty artificial radioisotopes of tellurium are known with atomic masses ranging from 105 to 142 and with half lives of 19 days or less.
6. It's difficult to find artificial radioisotope in a sentence. 用artificial radioisotope造句挺難的
7. Some artificial radioisotopes such as iodine-131 are chemically identical to natural isotopes needed by the body, and may be more readily absorbed if the individual has a deficit of that element.
8. The longest-lived artificial radioisotope is 121 Te with a half-life of nearly 19 days . Several nuclear isomers have longer half-lives, the longest being 121m Te with a half-life of 154 days.
9. There are also 30 artificial radioisotopes, the longest-lived of which is 194 Os with a half-life of 6 years, all others have half-lives under 94 days . There are also 9 known nuclear isomers, the longest-lived of which is 191m Os with a half-life of 13.10 hours.
10. There are also 35 known artificial radioisotopes, the longest-lived of which are 179 Ta with a half-life of 1.82 years, 182 Ta with a half-life of 114.43 days, 183 Ta with a half-life of 5.1 days, and 177 Ta with a half-life of 56.56 hours.
11. Over a timeframe of thousands of years, after the most active short half-life radioisotopes decayed, burying U . S . nuclear waste would increase the radioactivity in the top 2000 feet of rock and soil in the United States ( 10 million km 2 ) by natural radioisotopes in such a volume, but the vicinity of the site would have a far higher concentration of artificial radioisotopes underground than such an average.
12. "' Alternative fuels "', known as non-conventional and advanced fuels, are any materials or substances that can be used as fuels, other than conventional fuels like; " fossil fuels " ( petroleum ( oil ), coal, and natural gas ), as well as nuclear materials such as uranium and thorium, as well as artificial radioisotope fuels that are made in nuclear reactors.
13. Another 30 artificial radioisotopes of tungsten have been characterized, the most stable of which are 181 W with a half-life of 121.2 days, 185 W with a half-life of 75.1 days, 188 W with a half-life of 69.4 days, 178 W with a half-life of 21.6 days, and 187 W with a half-life of 23.72 h.
14. Since the fraction of a radioisotope's atoms decaying per unit of time is inversely proportional to its half-life, the relative radioactivity of a quantity of buried human radioactive waste would diminish over time compared to natural radioisotopes ( such as the decay chains of 120 trillion tons of thorium and 40 trillion tons of uranium which are natural radioisotopes in such a volume, although the vicinity of the site would have a far higher concentration of artificial radioisotopes underground than such an average.
15. Since the fraction of a radioisotope's atoms decaying per unit of time is inversely proportional to its half-life, the relative radioactivity of a quantity of buried human radioactive waste would diminish over time compared to natural radioisotopes ( such as the decay chain of 120 trillion tons of thorium and 40 trillion tons of uranium which are natural radioisotopes in such a volume, although the vicinity of the site would have a far higher concentration of artificial radioisotopes underground than such an average.
16. Thirty-three artificial radioisotopes of tungsten have been characterized with mass numbers ranging from 157 to 194, the most stable of which are 181 W with a half-life of 121.2 days, 185 W with a half-life of 75.1 days, 188 W with a half-life of 69.4 days and 178 W with a half-life of 21.6 days . All of the remaining radioactive isotopes have half-lives of less than 24 hours, and most of these have half-lives that are less than 8 minutes.