diff --git a/tests/popsicle_semenov_photo_cr_full_collapseTest/test.f90 b/tests/popsicle_semenov_photo_cr_full_collapseTest/test.f90
index 682b884..ebadfc9 100644
--- a/tests/popsicle_semenov_photo_cr_full_collapseTest/test.f90
+++ b/tests/popsicle_semenov_photo_cr_full_collapseTest/test.f90
@@ -181,8 +181,8 @@ program test_krome
        dissCO = 2.592d-10*krome_get_user_is_metal()*chiLW*get_fshield_CO(NH2,NCO)
        call krome_set_user_ionC(ionC)
        call krome_set_user_dissCO(dissCO)
-
-       chiFUV = chi0 * exp(-Nshield* dustUV_crossSection * d2g)
+       
+       chiFUV = (chiPE * 1.8e-4 + chiLW * 3.e-5)/J_FUV_ISRF
        call krome_set_user_chiFUV(chiFUV)
 
        !break when max density reached