Word: hydrogenized
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...ultracentrifuge - a machine which separates heavy molecules from light ones, inferentially measuring their molecular weights, by whirling them at enormous speeds. In this ultracentrifuge the molecular weight of the Stanley crystals was found to be about 17,000,000 units (17,000,000 times as heavy as a hydrogen atom...
...electro-magnet whose poles face each other vertically across an 8-in. gap. In the gap is placed a shallow cylindrical tank, pumped out to a high vacuum so that particles inside may move freely without interference from air molecules. Ions such as deuterons (nuclei of heavy hydrogen) are fed in at the centre...
Lawrence regards this gift as one of his two luckiest '"breaks." The other was the fact that University of California's Gilbert Lewis was making heavy water, containing heavy hydrogen, soon after its discovery by Columbia's Urey. Lewis let Lawrence have generous samples and Lawrence was the first man to use the heavy hydrogen nuclei-deuterons-as atomic projectiles. They are more effective than protons, easier to handle than alpha particles...
...crew carry small electroscopes in their pockets which they discharge into a meter at the end of the working day to see how much radiation they have been exposed to. Since neutrons cannot be controlled by magnetic fields and slide easily through almost all substances except those rich in hydrogen, Dr. Lawrence moved the control panel 60 ft. away from the apparatus and surrounded the machine with tanks of water six feet high, three feet thick (every water molecule contains two neutron-braking hydrogen atoms). No one is allowed inside this barrier when the cyclotron is running. Experiments on rats...
...Only the hydrogen atom contains no neutrons...