Data from Said Slassi at 5.8 g/cm²

PJ-2

The KCl radioactive sources in the spectrometer and the radioactive decay emissivity of the Al and the preamplifier have been taken into account.
 

Total background spectrum of HIREGS - measurement and calculation. The shield leakage component has been fitted in the high energy range (increase of the component of a factor ≈1.97 with respect to 3.5 g cm^-2). The Al and preamplifier emissivity has been calculated using GEANT/GCALOR and ENSDF data for 3 days of irradiation.

PJ-3

Comparison of the calculated and the modeled continuum background of HIREGS IV (see previous figure). The differences between the model and the measurement are also presented. Shield leakage component: fitting factor (mean rate in the shield leakage energy range) 1.97.

Estimations of the fraction of total continuum background rate induced by b- localized decays with the above background model. Two cases have been considered: ratio between the calculated beta component and total modeled continuum background, and,  ratio between the calculated beta component and total measured continuum background.

Numerical values are listed below (the rates are in counts s^-1 cm^-3 MeV^-1).

E (MeV)     b- loc           tot-calc.       tot-meas.    %c/m  fb(b-/calc)  fb (b-/meas)
2.000e-01   3.716e-02   1.756e-01   2.600e-01   32.5   2.117e-01   1.429e-01
3.000e-01   3.957e-02   1.215e-01   1.610e-01   24.5   3.257e-01   2.459e-01
4.000e-01   3.950e-02   9.073e-02   1.202e-01   24.5   4.353e-01   3.285e-01
5.000e-01   3.717e-02   7.350e-02   8.927e-02   17.7   5.058e-01   4.164e-01
6.000e-01   3.362e-02   6.202e-02   7.258e-02   14.6   5.421e-01   4.632e-01
7.000e-01   2.931e-02   5.458e-02   6.651e-02   17.9   5.369e-01   4.406e-01
8.000e-01   2.423e-02   4.676e-02   5.829e-02   19.8   5.183e-01   4.158e-01
9.000e-01   1.825e-02   3.851e-02   4.840e-02   20.4   4.739e-01   3.771e-01
1.000e+0    1.236e-02   2.938e-02   3.943e-02   25.5   4.208e-01   3.135e-01
1.100e+0    8.754e-03   2.460e-02   3.404e-02   27.7   3.559e-01   2.572e-01
1.200e+0    6.272e-03   2.188e-02   3.029e-02   27.8   2.866e-01   2.070e-01

PJ-4

PJ-5

Estimations of the fraction of total continuum background rate induced by localized events with the current background model. Two cases have been considered: ratio between the calculated localized component and total modeled continuum background, and,  ratio between the calculated and measured localized component and total measured continuum background.

Numerical values are listed below (the rates are in counts s^-1 cm^-3 MeV^-1).

E (MeV)     b- loc           tot-calc.       tot-meas.    %c/m  f_l(/calc)  f_l (/meas)      f_l(gamma)
2.000e-01   3.716e-02   1.756e-01   2.600e-01   32.5   5.881e-01   5.521e-01   4.774e-01
3.000e-01   3.957e-02   1.215e-01   1.610e-01   24.5   5.449e-01   4.910e-01   3.251e-01
4.000e-01   3.950e-02   9.073e-02   1.202e-01   24.5   5.815e-01   5.023e-01   2.588e-01
5.000e-01   3.717e-02   7.350e-02   8.927e-02   17.7   6.052e-01   5.338e-01   2.012e-01
6.000e-01   3.362e-02   6.202e-02   7.258e-02   14.6   6.278e-01   5.636e-01   1.871e-01
7.000e-01   2.931e-02   5.458e-02   6.651e-02   17.9   6.261e-01   5.484e-01   1.927e-01
8.000e-01   2.423e-02   4.676e-02   5.829e-02   19.8   6.106e-01   5.277e-01   1.917e-01
9.000e-01   1.825e-02   3.851e-02   4.840e-02   20.4   5.621e-01   4.815e-01   1.677e-01
1.000e+0    1.236e-02   2.938e-02   3.943e-02   25.5   5.047e-01   4.130e-01   1.449e-01
1.100e+0    8.754e-03   2.460e-02   3.404e-02   27.7   4.435e-01   3.582e-01   1.360e-01
1.200e+0    6.272e-03   2.188e-02   3.029e-02   27.8   3.842e-01   3.155e-01   1.368e-01