Determination of thorium, uranium and plutonium isotopes in atmospheric samples

Influence of soil texture on the distribution and availability of 238U, 230Th, and 226Ra in soils

“…7401VR), coupled to low-noise preamplifiers, amplifiers, and a multichannel analyser. For the uranium and thorium isotopes, chemical separation using tri-n-butyl phosphate (TBP), and further thorium purification by anionic exchange resin (Jiang et al, 1986), was followed by electrodeposition to form the high- resolution alpha sources (Hallstadius, 1984;Vera Tomé et al, 1994). The method used for the determination of radium was based on chemical purification by precipitation of PbSO 4 /BaSO 4 , and the subsequent source preparation by microprecipitation of Ba(Ra)SO 4 .…”

Fractionation of natural radionuclides in soils from a uranium mineralized area in the south-west of Spain

“…7401VR), coupled to low-noise preamplifiers, amplifiers, and a multichannel analyser. For the uranium and thorium isotopes, the radiochemical method followed up to the preparation of the high-resolution alpha sources was based on the chemical separation of these elements by tri-n-butyl phosphate (TBP), and further thorium purification by anionic exchange resin (Jiang et al, 1986). Finally, the sample was electrodeposited (Hallstadius, 1984;Vera Tome´et al, 1994).…”

An Internal Standard Method in α Spectrometric Determination of Uranium and Thorium Radioisotopes Using Instrumental Neutron Activation Analysis

“…Apart from the recent growth of mass spectrometry-based techniques, , which are more expensive and demanding in terms of equipment, the great bulk of such assays are performed by radiochemical separations, preparation of a “thin” (virtually massless) counting source, often by electrodeposition, and then α spectrometry, usually with a silicon surface barrier (SSB) detector and pulse height analyzer. Such classical procedures can be found detailed in the EML Procedures Manual , for example, or in numerous journal articles. − …”