Remove the redundant rad decay (#28707)

code/__DEFINES/radiation_defines.dm

@@ -68,11 +68,6 @@ Ask ninjanomnom if they're around
 /// The portion of a radiation wave that acts on the source tile.
 #define RAD_SOURCE_WEIGHT 0.25
 
-/// The point in steps at which radiation waves start to decay
-#define RAD_DECAY_POINT 10
-/// This multiplies the intensity of the radiation wave each step after reaching the decay point.
-#define RAD_DECAY_RATE 0.7943 // 1% after 20 tiles
-
 #define ALPHA_RAD 1
 #define BETA_RAD 2
 #define GAMMA_RAD 3

code/datums/radiation_wave.dm

@@ -80,9 +80,6 @@
 			offset += 2 * (steps - 1)
 
 	weights = new_weights
-	// With the spread each step being linear waves can spread very far. This limits the distance for performace reasons
-	if(steps > RAD_DECAY_POINT)
-		intensity *= RAD_DECAY_RATE
 
 /// Calls rad act on each relevant atom in the turf and returns the resulting weight for that tile after reduction by insulation
 /datum/radiation_wave/proc/radiate(atom/source, turf/current_turf, weight, emission_type)