Detection efficiency calculation for photons, electrons and positrons in a well detector. Part II: Analytical model versus simulations

New Analytical Formulae to Calibrate Well-type Scintillation Detectors Efficiency

“…This comparison shows that our values were in good agreement with Pomme et al [15], proving the success of our approach in predicting the efficiencies of these detectors over wide range of photon energy.…”

“…In this study we used two well type detectors [15], (1) IRMM is used in Figures 12-17 and (2) CIEMAT is used in Figure 18. The dimensions of the two detectors are given in Table 3 …”

“…The comparison between the calculated values of efficiencies and experimental ones provided in these papers shows that the error is very small. This method proves its accuracy and success for many detector geometries; like: coaxial detectors [1][2][3][4], parallelepiped detectors [5] and borehole detectors [12]; and types like: semiconductors [4][5][6][7] and scintillators [1][2][3] Besides, the direct mathematical method is built on simple mathematical approach and it does not need long computer programs nor previous experimental calculation of the efficiency of standard source like other Monte Carlo method [13][14][15][16]. In this work we used direct mathematical method to predict the efficiency of two well type detectors, in detecting the gamma photons produced by sources placed in their well cavities, over wide range of photon energy for seven different source geometries and positions including point sources with very small dimensions and cylindrical sources.…”

“…For each source geometry, a comparison between our calculated value of efficiencies using this approach and reference values obtained from Pomme et al [15] is given. This comparison shows that our values were in good agreement with Pomme et al [15], proving the success of our approach in predicting the efficiencies of these detectors over wide range of photon energy.…”

Standardisation of 241Am activity for a key comparison

“…The 4πmix-CsI counting method is akin to 4πγ counting with NaI(Tl) well detectors [21], except that the counting efficiency for particles adds significantly to the total detection probability. At that time, no dedicated software like STEFFY [22][23][24][25] or Monte Carlo routines were used for the efficiency calculation. The detection inefficiency was estimated at 0.03%, since the chance is low that no detectable pulse per decay is generated by the alpha particle, gamma rays, x rays, or secondary electrons.…”