نتایج جستجو برای: 232th
تعداد نتایج: 483 فیلتر نتایج به سال:
Telah dilakukan penelitian tentang penentuan aktivitas spesifik radionuklida alam pada sumber air panas di Nagari Pariangan Sumatera Barat. Tujuan ini untuk mengetahui 222Rn, 226Ra,232Th dan 40K. Penelitian menggunakan sampel yang diambil dari tiga berbeda. Aktivitas diukur dua alat yaitu Durridge Rad7 Radon Detector dengan protokol WAT250 222Rn spektrometer gamma Hasil diperoleh berdasarkan pe...
Phosphogypsum is a waste produced by the phosphate fertilizer industry. Although phosphogypsum is mainly calcium sulphate dihydrate, it contains elevated levels of impurities, which originate from the source phosphate rock used in the phosphoric acid production. Among these impurities, radionuclides from 238U and 232Th decay series are of most concern due to their radiotoxicity. Other elements,...
Radiometric investigation in a rainforest of the Golfo Dulce region of southern Costa Rica has shown the presence of the anthropogenic radionuclides caesium-137, strontium-90 and the plutonium isotopes 238, 239 and 240 along with the naturally occurring radionuclides 7Be, 40K, 238U and 232Th, and respective progenies. 137Cs, 90Sr and Pu can be attributed to global fallout; no other sources coul...
Parity nonconservation (PNC) was measured for 24 p-wave resonances from 8 to 300 eV in 232Th by measuring the helicity dependence of the total neutron cross section for epithermal neutrons with an improved experimental system. Ten resonances show statistically significant parity violation. For these ten resonances the analyzing powers are all positive, thus confirming the previously observed si...
background: human activities such as mining enhance the radioactivity levels above normal background which can lead to an incremental increase in the radiation risk to the population. materials and methods: 20 tailing enriched soil samples collected around maiganga coal mine, gombe, northeast nigeria were assessed for their 226ra, 232th and 40k contents using hpge gamma-ray detector. results: t...
Background: All human beings and living organisms are exposed to natural radiations on daily basis, which is mainly due to the activity concentration of primordial radionuclides 232Th, 238U and their products of decay together with the natural radionuclide 40K present in the earth’s crust. Materials and Methods: A total of 59 soil samples were collected around the banks and surroundings of the ...
The neutron and proton density distributions obtained in constrained Hartree-Fock-Bogolyubov calculations with the Gogny force along the fission paths of 232Th, 236U, 238U, and 240Pu are analyzed. Significant differences in the multipole deformations of neutron and proton densities are found. The effect on potential energy surfaces and on barrier heights is studied under an additional constrain...
Compositions of arc magmas depend on several factors and are often thought to reflect conditions in the mantle wedge at slab-mantle interface. However, continental settings, also influenced by assimilation crust. Here, we present measurements modeling 238U-230Th activity ratios, Sr, Nd, Hf, Pb isotopic compositions, major trace element concentrations young, historic lavas erupted from Reventado...
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