Extension of Studies with 3M Empore TM and Selentec MAG *SEP SM Technologies for Improved Radionuclide Field Sampling

Radionuclide analysis using solid phase extraction disks

“…We next designed a study to look at the discrimination of the Tc RAD disk against other beta emitting radionuclides which may interfere in the beta proportional counting of Tc-99. Deionized water (one liter) was spiked with either 330 pCi of Cs-137,1400 pCi of (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) or 400 pCi of Sr-90.…”

“…The Cs-137 concentration of the solution or disk was measured by gamma spectrometry, using the 661. 6 KeV gamma ray of Cs-137 for calculation ofthe sample activity. Although Cs-137 is also a beta emitter, the K-40 in the matrix of the KCFC disk precludes the use of beta proportional counting for the detefinination of Cs-137 activity.…”

An Improved Method for the Separation of 210Bi and 210Po from 210Pb by Using Solid-Phase Extraction Disk Membranes: Environmental Applications

“…Recently, soüd-phase extraction (SPE) techniques that employ extraction disk membranes in place of the traditional short packed columns have become commonly used for the Separation of analytes from water samples [26][27][28][29]. The membranes are constructed of a uniform web-like matrix of inert polytetrafluoroethylene (PTFE) that is densely packed with sorbent particles.…”

“…The most common use of SPE membranes has been in the Separation of pesticides from water; in this apphcation, hydrophobic octyl-and octadecyl-bonded silica particles are incorporated into the inert matrix [26,27]. However, metals and radionuclides can also be extracted by using polymer-based sorbent particles capable of chelating multivalent metal cations, similar to the resins used in anion exchange chromatography [28].…”