Radiochemical determination of technetium-99

Determination of technetium-99 in environmental samples: A review

“…The method adopted for the chemical separation of 99 Tc should be able not only to give a good decontamination from interferences but also to provide a high chemical yield of 99 Tc. For measurement of 99 Tc using radiometric methods, a thorough chemical separation of almost all other radionuclides from 99 Tc is required because of bad spectrometric resolution of the beta counting method [61,96]. For measurement of 99 Tc using mass spectrometric methods, for example ICP-MS, besides the interference of matrix elements, the interferences from isobaric and molecular ions in the mass of 99 is the main challenge [21,97].…”

“…LSC has been accepted as the generally preferred method for counting soft β emitters such as 99 Tc (a pure β -emitter with a maximum energy of 0.294 MeV) [8,96]. This technique is based on radiation-induced light formation and transformation of the light into electric pulses.…”

Radionuclide Sensors for Subsurface Water Monitoring

“…Use of anion exchange materials for pertechnetate separations is well known. [35,[44][45][46][47][48][49][50][51] Figure 3a,b illustrate the sensor response and % breakthrough for a single Tc standard followed by a blank. A steady state signal is observed at full breakthrough, and the response is completely reversible.…”

Radioanalytical Chemistry for Automated Nuclear Waste Process Monitoring

“…Separation chemistries to quantitatively capture and purify total Tc require that the Tc be in the pertechnetate state; nonpertechnetate species are not retained by anion exchange, extraction chromatographic or sorbent extraction materials useful in the analytical separation of 99 Tc. [1][2][3][4][5][6][7][8] This sample treatment system and separation is part of an integrated 99 Tc automated radiochemical analyzer system that processes and analyzes nuclear waste samples in 15 minutes or less, using anion exchange chemistry to separate Tc from other radioactive species and a flow through solid scintillator detector. The effectiveness of the automated instrumentation and sample treatment procedures was demonstrated using actual aged nuclear waste solutions with high content of organic and nonpertechnetate species.…”