Thx Madam for the explanation . Kalau makanan yang RELATIF mengandung / mengabsorb radioaktif apa ya ?
Si Abah > extra info, Pak. > > > > Plants absorb some uranium from soil. Dry weight concentrations of uranium > in > plants range from 5 to 60 parts per billion, and ash from burnt wood can > have > concentrations up to 4 parts per million.[18] Dry weight concentrations of > uranium in food plants are typically lower with one to two micrograms per > day > ingested through the food people eat.[18] > http://en.wikipedia.org/wiki/Uranium > http://www.curie.fr/fondation/musee/marie-pierre-curie.cfm/lang/_gb.htm > http://www.project2061.org/publications/sfaa/online/chap10.htm > > Pierre (1859-1906) and Marie (1867-1934) Curie > Contributions: Pierre and Marie were award the Noble Prize in Physics in > 1903 > for their work on radioactivity. Marie Curie became the first woman to be > awarded the nobel prize and the first person to obtain two nobel prizes > when she > won the prize for the discovery of Polonium and Radium in 1911. > Though it was Henri Becquerel that discovered radioactivity, it was Marie > Curie > who coined the term. Using a device invented by her husband and his > brother, > that measured extremely low electrical currents, Curie was able to note > that > uranium electrified the air around it. Further investigation showed that > the > activity of uranium compounds depended upon the amount of uranium present > and > that radioactivity was not a result of the interactions between molecules, > but > rather came from the atom itself. Using Pitchblende and chalcolite Curie > found > that Thorium was radioactive as well. She later discovered two new > radioactive > elements: Radium and Polonium which took her several years since these > elements > are difficult to extract and extremely rare. Unfortunately, the Curies > died > young. Pierre Curie was killed in a street accident and Marie died of > aplastic > anemia, almost certainly a result of radiation exposure. > > > salam, > iin fr > > > > ________________________________ > From: Rovicky Dwi Putrohari <rovi...@gmail.com> > To: geologi...@googlegroups.com; IAGI <iagi-net@iagi.or.id>; > katg...@googlegroups.com > Sent: Thu, July 22, 2010 2:21:58 PM > Subject: [iagi-net-l] Menghasilkan bahan bakar nuklir dari limbah batubara > > Mungkin banyak yang masih menganggap bahwa batubara itu merupakan produk > sisa tumbuhan sehingga lebih alami mendekati mahluk hayati. Dari sisi > radiasi banyak spekulasi menganggap batubara itu bebas radiasi. Tapi > artikel > yang cukup lama (2007) dibawah ini mungkin akan menjadikan kita berpikir > ulang tentang radiasi batubara. > > http://www.world-nuclear-news.org/newsarticle.aspx?id=14224 > > Sparton produces first yellowcake from Chinese coal ash > 16 October 2007 > > Sparton Resources announced that it had successfully produced a small > quantity of yellowcake (U3O8) from fly ash from a Chinese coal-fired power > plant. > > The uranium extraction test work is being conducted by Sparton's > processing > engineering consulting firm Lyntek Inc of Denver, Colorado, USA. The test > to > produce yellowcake used 6.1 kg of mixed fly ash produced at the > Xiaolongtang > power plant. The ash averaged some 0.4 pounds of U308 per tonne of ash > (160 > parts per million uranium). > > Leaching was done with sulphuric acid and the yellowcake was produced by > passing the filtered leach solution through a standard ion exchange resin, > stripping the resin and precipitating the uranium compound. This process > is > essentially similar to the uranium extraction and yellowcake production > methods used by primary uranium ore processing plants or in-situ leach > (ISL) > operations using an acidic leaching solution. > > > > New test work currently in progress will focus on refining the leaching, > filtering and ion exchange processes. The leach solutions contain > significant amounts of gypsum and iron oxide which require removal by > filtering prior to passing them through the ion exchange system. The next > tests will evaluate uranium extraction from ash from the large waste pile > at > Xiaolongtang. A 20 kg representative sample taken from drill holes used to > test the waste pile will be used for this work. > > Xiaolongtang coal-ash stockpil > > > Meanwhile, Sparton said that a drilling program on the fly ash waste pile > at > Xiaolongtang was completed in September and the results indicated that > pile > is on average some 17 metres thick and contains around 5.3 million tonnes > of > ash. In July, Sparton suggested that the stockpile could contain up to 10 > million tonnes of coal ash. Staff at the power plant had previously > estimated there were some 5 million tonnes of ash. Initial tests by Lyntek > indicated that the material contains some 0.46 pounds of U308 per tonne of > ash (160-180 parts per million uranium), suggesting a total of some 2085 > tonnes U3O8 (1770 tU) are contained in the Xiaolongtang ash piles. > > In early January 2007, Canada's Sparton announced the signing of an > agreement with the Xiaolongtang Guodian Power Company for a three-phase > program to test and possibly commercialize the extraction of uranium from > waste coal ash at the company's thermal power stations in Yunnan province. > Sparton, together with its partner ARCN - the remote sensing and research > branch of state-owned China National Nuclear Corp (CNNC) - has identified > Xiaolongtang and nearby power plants as a possible major supply of > uraniferous coal ash. > > The Xiaolongtang, Dalongtang and the Kaiyuan stations, all located within > 20 > km of each other, burn coal from a centrally located open pit lignite coal > mine that contains anomalously high uranium content. The plants are > located > approximately 250 km southeast of the Yunnan provincial capital of > Kunming. > > Since signing the agreement with China, Sparton has also signed agreements > to do similar programs in six countries in Central Europe and with South > Africa. > > Further information > > Sparton Resources <http://www.spartonres.ca/> > > WNA's Naturally-Occurring Radioactive Materials > (NORM)<http://www.world-nuclear.org/info/inf30.html> > information paper > > WNN: Sparton: More coal ash, more > uranium<http://www.world-nuclear-news.org/industry/Sparton_More_uranium_in_Chinese_coal_ash-020807.shtml> > > WNN: WildHorse and Sparton study coal > ash<http://www.world-nuclear-news.org/explorationNuclearFuel/250507-WildHorse_and_Sparton_study_European_coal_ash.shtml> > > WNN: CNNC looks for new sources of > uranium<http://www.world-nuclear-news.org/explorationNuclearFuel/180507-CNNC_looks_for_new_sources_of_uranium.shtml> > > WNN: Project to extract uranium from coal > ash<http://www.world-nuclear-news.org/industry/020207-Project_to_extract_uranium_from_coal_ash.shtml> > > > -- _______________________________________________ Nganyerikeun hate batur hirupna mo bisa campur, ngangeunahkeun hate jalma hirupna pada ngupama , Elmu tungtut dunya siar Ibadah kudu lakonan.
