Depleted uranium consists mainly of 235 U which decays with a similar half-life of about 7.038 ?10 8 years, both of them would still be regarded as weak alpha emitters and their radioactivity is only hazardous with direct contact or ingestion.
32.
Our latest HST observations demonstrate that the extreme GPs are Lyman-alpha emitters ( LAEs ), with the strongest Lya emission present in objects that lack absorption lines from the neutral interstellar medium ( ISM ), such as Carbon II ( wavelength133.5 nm ).
33.
The second longest-living astatine-211 is the only one to find a commercial use, being useful as an alpha emitter in medicine; however, only extremely small quantities are used, and in larger ones it is very hazardous, as it is intensely radioactive.
34.
Really, the last thing you need is a faceful ( followed by a lungful ) of an alpha emitter compound if you accidentally jostle the pigs and the lid comes off one of them . . .-- talk ) 02 : 07, 20 August 2008 ( UTC)
35.
The alpha emitter and the beryllium are pulverized and mixed together in close intimate contact to insure a high percentage of alpha-emitter and beryllium nuclei in close contact, since the alpha has a very short range through material, and would lose energy preventing reaction if sufficiently far away.
36.
"' Electrostatic control "'- To avoid the build-up of static electricity in production of paper, plastics, synthetic textiles, etc ., a ribbon-shaped source of the alpha emitter 241 Am can be placed close to the material at the end of the production line.
37.
However, in spent nuclear fuel that does not quickly undergo nuclear reprocessing but instead is cooled for years after use, much or most of the Pu-241 will beta decay to americium-241, one of the minor actinides, a strong alpha emitter, and difficult to use in thermal reactors.
38.
Note, by the way, that the amount produced is probably almost identically to the amount used on Earth today, since it has a relatively long half life ( it is a weak alpha emitter ) .-- 24.147.86.187 22 : 58, 7 September 2007 ( UTC)
39.
Fissile Pu-239 is produced following neutron capture by uranium-238, but further neutron capture will produce Pu-240 which is less fissile and worse, is a fairly strong neutron emitter, and Pu-241 which decays to Am-241, a strong alpha emitter that poses self-heating and radiotoxicity problems.
40.
Radium-226 has a half-life of about 1600 years, whereas polonium-210 is only about 138 days . ( And they're both alpha emitters of comparable energy, so it's an apples-to-apples comparison . )-- Trovatore 04 : 22, 1 December 2006 ( UTC)
