Comparison of experimental and calculated calibration coefficients for a high sensitivity ionization chamber

Uncertainty evaluation in activity measurements using ionization chambers

“…However, as such tools often provide limited output data; this may complicate the subsequent uncertainty evaluation. mixtures of argon and xenon [28], or else nitrogen). The situation is even more complicated for beta emitters because of the continuous energy spectrum.…”

“…Therefore a very good knowledge of the chamber characteristics and its implementation in the code are needed. The geometric model can be implemented in the simulation using the manufacturer's specifications or dra wings and also using radiographs directly taken on the chamber itself [23,28].…”

“…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. The estimation is performed using the ratio of simulated and experimental efficiencies in [17,23,28,32] where a difference of 1%-2% is found or similarly in [30,36] and a difference of up to 5% is obtained.…”

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

“…The chamber is housed in a locally made shielding in order to reduce the background. The PENELOPE simulation model of this chamber (geometry and sample-to-detector configuration) has been well-validated through different comparisons and for several gamma-emitting radionuclides (Amiot et al, 2012). The geometry used in our work is shown in Fig.…”

“…), 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). In these cases, the IC response strongly depends on the transport of electrons in the radioactive solution and surroundings.…”