SIMPLEX method for optimization of experiments Application to electrodeposition in alpha spectrometry

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

“…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). The method used for the determination of radium was based on a chemical purification by precipitation of PbSO 4 /BaSO 4 , and the subsequent source preparation by microprecipitation of Ba(Ra)SO 4 .…”

Vertical distribution of natural radionuclides in soils

“…For the uranium and thorium isotopes, chemical separation using tri-n-butyl phosphate (TBP), and further thorium purification by anionic exchange resin [4], was followed by electrodeposition to form the high-resolution alpha sources [5]. The method used for the determination of radium was based on chemical purification by co-precipitation of PbSO 4 /BaSO 4 , and the subsequent source preparation by microprecipitation of Ba(Ra)SO 4 [6].…”