diff --git a/config/drich.json b/config/drich.json
new file mode 100644
index 000000000..2d2aff4ff
--- /dev/null
+++ b/config/drich.json
@@ -0,0 +1,34 @@
+{
+  "torch": {
+    "gentype": "TORCH",
+    "trackid": 0,
+    "matline": 0,
+    "numphoton": 10000,
+
+    "pos": [776.5, 402.6, 2590.0],
+    "time": 0.0,
+
+    "mom": [0.7621, 0.4400, -0.4750],
+    "weight": 0.0,
+
+    "pol": [1.0, 0.0, 0.0],
+    "wavelength": 420.0,
+
+    "zenith": [0.0, 1.0],
+    "azimuth": [0.0, 1.0],
+
+    "radius": 10.0,
+    "distance": 0.0,
+    "mode": 255,
+    "type": "disc"
+  },
+
+  "event": {
+    "mode": "HitPhoton",
+    "maxslot": 1000000,
+    "max_bounce": 31,
+    "propagate_epsilon": 0.05,
+    "propagate_epsilon0": 0.05,
+    "propagate_epsilon0_mask": "TO,CK,SI,SC,RE"
+  }
+}
diff --git a/src/GPUCerenkov.h b/src/GPUCerenkov.h
index 40c417939..d9cb1a46c 100644
--- a/src/GPUCerenkov.h
+++ b/src/GPUCerenkov.h
@@ -1,6 +1,7 @@
 #include <filesystem>
 #include <fstream>
 #include <iostream>
+#include <string>
 
 #include "G4AutoLock.hh"
 #include "G4BooleanSolid.hh"
@@ -263,6 +264,7 @@ struct DetectorConstruction : G4VUserDetectorConstruction
     {
         G4cout << "ConstructSDandField is called." << G4endl;
         G4SDManager *SDman = G4SDManager::GetSDMpointer();
+        size_t       sensitive_index = 0;
 
         const G4GDMLAuxMapType *auxmap = parser_.GetAuxMap();
         for (auto const &[logVol, listType] : *auxmap)
@@ -272,7 +274,7 @@ struct DetectorConstruction : G4VUserDetectorConstruction
                 if (auxtype.type == "SensDet")
                 {
                     G4cout << "Attaching sensitive detector to logical volume: " << logVol->GetName() << G4endl;
-                    G4String name = logVol->GetName() + "_PhotonDetector";
+                    G4String  name = logVol->GetName() + "_" + std::to_string(sensitive_index++) + "_PhotonDetector";
                     PhotonSD *aPhotonSD = new PhotonSD(name);
                     SDman->AddNewDetector(aPhotonSD);
                     logVol->SetSensitiveDetector(aPhotonSD);
diff --git a/src/GPURaytrace.h b/src/GPURaytrace.h
index 14606bfe3..03308240f 100644
--- a/src/GPURaytrace.h
+++ b/src/GPURaytrace.h
@@ -1,6 +1,7 @@
 #include <filesystem>
 #include <fstream>
 #include <iostream>
+#include <string>
 
 #include "G4AutoLock.hh"
 #include "G4BooleanSolid.hh"
@@ -264,6 +265,7 @@ struct DetectorConstruction : G4VUserDetectorConstruction
     {
         G4cout << "ConstructSDandField is called." << G4endl;
         G4SDManager *SDman = G4SDManager::GetSDMpointer();
+        size_t       sensitive_index = 0;
 
         const G4GDMLAuxMapType *auxmap = parser_.GetAuxMap();
         for (auto const &[logVol, listType] : *auxmap)
@@ -273,7 +275,7 @@ struct DetectorConstruction : G4VUserDetectorConstruction
                 if (auxtype.type == "SensDet")
                 {
                     G4cout << "Attaching sensitive detector to logical volume: " << logVol->GetName() << G4endl;
-                    G4String name = logVol->GetName() + "_PhotonDetector";
+                    G4String  name = logVol->GetName() + "_" + std::to_string(sensitive_index++) + "_PhotonDetector";
                     PhotonSD *aPhotonSD = new PhotonSD(name);
                     SDman->AddNewDetector(aPhotonSD);
                     logVol->SetSensitiveDetector(aPhotonSD);
diff --git a/src/g4app.h b/src/g4app.h
index faf30feb5..69dc3ee7a 100644
--- a/src/g4app.h
+++ b/src/g4app.h
@@ -1,5 +1,6 @@
 #include <cstring>
 #include <filesystem>
+#include <string>
 #include <type_traits>
 #include <utility>
 #include <vector>
@@ -150,6 +151,7 @@ struct DetectorConstruction : G4VUserDetectorConstruction
     void ConstructSDandField() override
     {
         G4SDManager* SDman = G4SDManager::GetSDMpointer();
+        size_t       sensitive_index = 0;
 
         const G4GDMLAuxMapType* auxmap = parser_.GetAuxMap();
         for (auto const& [logVol, listType] : *auxmap)
@@ -159,7 +161,7 @@ struct DetectorConstruction : G4VUserDetectorConstruction
                 if (auxtype.type == "SensDet")
                 {
                     G4cout << "DetectorConstruction::ConstructSDandField: Attach sensitive detector to logical volume: " << logVol->GetName() << G4endl;
-                    G4String  name = logVol->GetName() + "_PhotonDetector";
+                    G4String  name = logVol->GetName() + "_" + std::to_string(sensitive_index++) + "_PhotonDetector";
                     PhotonSD* aPhotonSD = new PhotonSD(name);
                     SDman->AddNewDetector(aPhotonSD);
                     logVol->SetSensitiveDetector(aPhotonSD);
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ab4a1205d..6ad1f41ef 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -28,6 +28,7 @@ add_simg4ox_integration_test(raindrop)
 add_simg4ox_integration_test(dune_mock_wls_detector_box)
 add_simg4ox_integration_test(8x8SiPM_w_CSI_optial_grease)
 add_simg4ox_integration_test(opticks_two_spheres)
+add_simg4ox_integration_test(drich)
 
 set(SIMPHONY_SIMG4OX_MULTIEVENT_TEST_WORKDIR "${CMAKE_CURRENT_BINARY_DIR}/simg4ox_multievent")
 file(MAKE_DIRECTORY "${SIMPHONY_SIMG4OX_MULTIEVENT_TEST_WORKDIR}")
diff --git a/tests/test_simg4ox.sh b/tests/test_simg4ox.sh
index 32c1d5c84..648a51fed 100755
--- a/tests/test_simg4ox.sh
+++ b/tests/test_simg4ox.sh
@@ -21,6 +21,7 @@ usage() {
     echo "  dune_mock_wls_detector_box" >&2
     echo "  8x8SiPM_w_CSI_optial_grease" >&2
     echo "  opticks_two_spheres" >&2
+    echo "  drich" >&2
 }
 
 if [[ $# -gt 1 ]]; then
@@ -50,6 +51,7 @@ run_record_validation() {
 run_hit_validation() {
     local geometry=$1
     local config_name=$2
+    local macro_file=${3:-${MAC_FILE}}
     local run_log="${PWD}/simg4ox.log"
 
     rm -f "${PWD}/g_hits.npy" "${PWD}/s_hits.npy" "${run_log}"
@@ -58,7 +60,7 @@ run_hit_validation() {
     "${SIMG4OX_BIN}" \
         -g "${REPO_DIR}/tests/geom/${geometry}.gdml" \
         -c "${config_name}" \
-        -m "${MAC_FILE}" \
+        -m "${macro_file}" \
         -s "${SEED}" > "${run_log}" 2>&1
 
     "${PYTHON}" "${COMPARE_AB}" hits "${PWD}/g_hits.npy" "${PWD}/s_hits.npy" \
@@ -82,6 +84,13 @@ case "${TEST_CASE}" in
         # regression where each PhotonSD overwrites g_hits.npy with its own collection.
         run_hit_validation opticks_two_spheres dev
         ;;
+    drich)
+        # Loading the full geometry exercises conversion of its partial-phi
+        # sphere and tube solids. The torch aims identical optical photons at
+        # a SiPM patch for a stable, nonzero CPU/GPU hit comparison.
+        # Invoke Geant4 SDs for the EFFICIENCY=1 SiPM skin surfaces.
+        run_hit_validation drich drich "${REPO_DIR}/tests/run_validate.mac"
+        ;;
     *)
         echo "Unknown simg4ox test case: ${TEST_CASE}" >&2
         usage