diff --git a/Content.Server/Radiation/Systems/RadiationSystem.cs b/Content.Server/Radiation/Systems/RadiationSystem.cs
index 34dbec6f86..4a4d0f8930 100644
--- a/Content.Server/Radiation/Systems/RadiationSystem.cs
+++ b/Content.Server/Radiation/Systems/RadiationSystem.cs
@@ -49,9 +49,9 @@ public sealed partial class RadiationSystem : EntitySystem
         _accumulator = 0f;
     }
 
-    public void IrradiateEntity(EntityUid uid, float radsPerSecond, float time)
+    public void IrradiateEntity(EntityUid uid, float radsPerSecond, float time, EntityUid? origin = null)
     {
-        var msg = new OnIrradiatedEvent(time, radsPerSecond, uid);
+        var msg = new OnIrradiatedEvent(time, radsPerSecond, origin);
         RaiseLocalEvent(uid, msg);
     }
 
diff --git a/Content.Shared/Radiation/Events/OnIrradiatedEvent.cs b/Content.Shared/Radiation/Events/OnIrradiatedEvent.cs
index ec9988fffb..fdf7b21cd0 100644
--- a/Content.Shared/Radiation/Events/OnIrradiatedEvent.cs
+++ b/Content.Shared/Radiation/Events/OnIrradiatedEvent.cs
@@ -4,13 +4,13 @@ namespace Content.Shared.Radiation.Events;
 ///     Raised on entity when it was irradiated
 ///     by some radiation source.
 /// </summary>
-public readonly record struct OnIrradiatedEvent(float FrameTime, float RadsPerSecond, EntityUid Origin)
+public readonly record struct OnIrradiatedEvent(float FrameTime, float RadsPerSecond, EntityUid? Origin)
 {
     public readonly float FrameTime = FrameTime;
 
     public readonly float RadsPerSecond = RadsPerSecond;
 
-    public readonly EntityUid Origin = Origin;
+    public readonly EntityUid? Origin = Origin;
 
     public float TotalRads => RadsPerSecond * FrameTime;
 }