Calculation of calibration figures and the volume correction factors for 90Y, 125I, 131I and 177Lu radionuclides based on Monte-Carlo ionization chamber simulation method

Investigation of the response variability of ionization chambers for the standard transfer of SIR-Spheres ®

“…Based on the measurement of the total charge generated in the gaseous region (due to electron/ion pairs created) the IC response and therefore the calibration coefficient is sensitive to the chamber design (chamber liners, type of filling gas and shielding), the nature of the solution (volume and composition), the vial dimensions, the source holder and also the radionuclide decay scheme. MC simulations of radiation-matter interactions are very useful to study the resulting effects of those properties or the addition of other elements such as liners (Ceccatelli et al, 2007, Kryeziu et al, 2007, de Vismes and Amiot, 2003. In this framework, several investigations based on the use of MC calculations to estimate calibration coefficients have already been implemented at LNE-LNHB.…”

Uncertainty evaluation in activity measurements using ionization chambers

“…For instance the W value for Argon, which is given to be around 23.8 eV and 26.4 eV in [33] is used by Olsovcová [30] for two different chambers. In [23] and [35] the minimization is obtained by increasing the gas pressure value of several percent with respect to the one supplied by the chamber manufacturer. In [36], Gostely and Laedermann studied the effect of the vertical source position in the chamber as well as the thickness of different parts such as the electrodes or the re-entrant tube.…”

Simulation of the response of an ionization chamber to 214Bi emission. Application to the measurement of 222Rn

“…The response of such instruments i.e., the measured ionization current (which is related to the total energy deposited in the IC gas volume), depends on the chamber design (wall thickness, nature and pressure of the filling gas), the nature and dimensions of the source (type of vial or ampoule, filling height of radioactive sample, etc. ), and the shielding around (Ceccatelli et al, 2007;Kryeziu et al, 2007;Thiam et al, 2016). Generally, ICs are well adapted for solutions of gamma-emitting radionuclides (Amiot et al, 2012;Zimmerman and Judge, 2007) but can also be used for high-energy beta-emitting radionuclides such as 90 Y, although such measurements are more challenging (Pearce et al, 2007;Fenwick et al, 2014).…”