diff --git a/geometry/estia_cave.i b/geometry/estia_cave.i
index a8d30a8..d471c81 100644
--- a/geometry/estia_cave.i
+++ b/geometry/estia_cave.i
@@ -14,21 +14,21 @@ c floor
 208711    49 0.074981   208703 208803 208707 208708 208709 (208706:(208805
          -208302)) 208710
 c walls
-208712    50 0.074981   -208803 -208801 208709 -208705 -208312 -208302
-208713    50 0.074981   -208803 -208801 -208302 208806 208705 208805
+208712    51 0.074981   -208803 -208801 208709 -208705 -208312 -208302
+208713    51 0.074981   -208803 -208801 -208302 208806 208705 208805
 c heavy      concrete
 c 208714   200   -3.9   -208803 -208801 -208805 -208810 208806 208706
-208714    50 0.074981   -208803 -208801 -208805 -208810 208806 208706 
-208715    50 0.074981   -208803 -208801 208706 208707 208810 208710
-208716    50 0.074981   -208803 -208801 -208810 208707 208807 -208808
-208717    50 0.074981   -208803 -208801 208707 208808 208708 208709
-208718    50 0.074981   -208803 -208801 208311 208809 208709 -208808
+208714    51 0.074981   -208803 -208801 -208805 -208810 208806 208706 
+208715    51 0.074981   -208803 -208801 208706 208707 208810 208710
+208716    51 0.074981   -208803 -208801 -208810 208707 208807 -208808
+208717    51 0.074981   -208803 -208801 208707 208808 208708 208709
+208718    51 0.074981   -208803 -208801 208311 208809 208709 -208808
 c ceiling
-208719    50 0.074981   208801 208701 208710 208707 (208706:(208805 -208302))
+208719    51 0.074981   208801 208701 208710 208707 (208706:(208805 -208302))
          208708 208709 #(208712 208710 208711) #(-208311 208809 208312)
-208720    50 0.074981   208801 208702 208709 208712 208711 208710 #(-208810
+208720    51 0.074981   208801 208702 208709 208712 208711 208710 #(-208810
          -208812 -208811 -208802) #(-208311 208809 208312)
-208721    50 0.074981   208313 208702 208709 208809 208711 208712
+208721    51 0.074981   208313 208702 208709 208809 208711 208712
 c sample position
 c 209001 19 -8.65  -209002 209003 -209004 $ Cd
 c 209001 2 -7.08   -209002 209003 -209004 $ GGG
diff --git a/geometry/materials.i b/geometry/materials.i
index 76361ec..2afbe21 100644
--- a/geometry/materials.i
+++ b/geometry/materials.i
@@ -151,6 +151,16 @@ m50     1001     0.00776555 1002     1.16501e-06 8016     0.0438499
 mt50    lwtr.10t
 mx50:h  3j model 1r j  j model 2r  3j model 2r
 c
+c Material : Concrete rho=0.075731 added 1.0% Boron
+m51     1001     0.00776555 1002     1.16501e-06 8016     0.0438499
+        11023     0.00104778 12000.60c 0.000148662 13027     0.00238815
+        14028     0.0158026 16032     5.63433e-05 19000.60c 0.000693104
+        20000.60c 0.00291501 26054     1.84504e-05 26056     0.000286826 
+        26057     6.5671e-06 26058     8.75613e-07
+        5010      1.49998e-4 5011      5.998478e-04
+mt51    lwtr.10t
+mx51:h  3j model 1r j  j model 2r  3j model 2r
+c
 c Material : CastIron rho=0.0833854
 m54     6000     0.00636 14028     0.0051404 25055     0.000386
         26054     0.00419 26056     0.065789 26057     0.00152