diff --git a/technic/radiation.lua b/technic/radiation.lua
index 93d07c79..bae580ad 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -34,8 +34,8 @@ local cache_radiation_resistance = {}
 
 -- Function to register node-specific resistance
 function technic.register_rad_resistance(node_name, resistance)
-    rad_resistance_node[node_name] = resistance
-    cache_radiation_resistance[node_name] = nil -- Invalidate cache
+	rad_resistance_node[node_name] = resistance
+	cache_radiation_resistance[node_name] = nil -- Invalidate cache
 end
 
 local S = technic.getter
@@ -177,18 +177,18 @@ local node_resistances = {
 
 -- Register all node resistances at once
 for node_name, resistance in pairs(node_resistances) do
-    technic.register_rad_resistance(node_name, resistance)
+	technic.register_rad_resistance(node_name, resistance)
 end
 
 -- Function to register group-specific resistance
 function technic.register_group_resistance(group_name, resistance)
-    rad_resistance_group[group_name] = resistance
-    -- Invalidate cache for all nodes in this group
-    for node_name, def in pairs(minetest.registered_nodes) do
-        if def.groups[group_name] then
-            cache_radiation_resistance[node_name] = nil
-        end
-    end
+	rad_resistance_group[group_name] = resistance
+	-- Invalidate cache for all nodes in this group
+	for node_name, def in pairs(minetest.registered_nodes) do
+		if def.groups[group_name] then
+			cache_radiation_resistance[node_name] = nil
+		end
+	end
 end
 
 technic.register_group_resistance("concrete", 16)
@@ -198,39 +198,39 @@ technic.register_group_resistance("wood", 1.7)
 
 -- Function to calculate radiation resistance
 function node_radiation_resistance(node_name)
-    local resistance = cache_radiation_resistance[node_name]
-    if resistance then
-        return resistance
-    end
-    local def = minetest.registered_nodes[node_name]
-    if not def then
-        cache_radiation_resistance[node_name] = 0
-        return 0
-    end
-
-    -- Check for rad_resistance group in node definition
-    resistance = 0
-    for g, v in pairs(def.groups) do
-        if g == "rad_resistance" then
-            resistance = resistance + v
-        end
-    end
-
-    -- If no rad_resistance group, use registered node-specific resistance
-    if resistance >= 0 then
-        resistance = rad_resistance_node[node_name] or 0
-    end
-
-    -- Add group-specific resistance if applicable
-    for g, v in pairs(def.groups) do
-        if v > 0 and rad_resistance_group[g] then
-            resistance = resistance + rad_resistance_group[g]
-        end
-    end
-
-    resistance = math.sqrt(resistance)
-    cache_radiation_resistance[node_name] = resistance
-    return resistance
+	local resistance = cache_radiation_resistance[node_name]
+	if resistance then
+		return resistance
+	end
+	local def = minetest.registered_nodes[node_name]
+	if not def then
+		cache_radiation_resistance[node_name] = 0
+		return 0
+	end
+	
+	-- Check for rad_resistance group in node definition
+	resistance = 0
+	for g, v in pairs(def.groups) do
+		if g == "rad_resistance" then
+			resistance = resistance + v
+		end
+	end
+
+	-- If no rad_resistance group, use registered node-specific resistance
+	if resistance >= 0 then
+		resistance = rad_resistance_node[node_name] or 0
+	end
+
+	-- Add group-specific resistance if applicable
+	for g, v in pairs(def.groups) do
+		if v > 0 and rad_resistance_group[g] then
+			resistance = resistance + rad_resistance_group[g]
+		end
+	end
+
+	resistance = math.sqrt(resistance)
+	cache_radiation_resistance[node_name] = resistance
+	return resistance
 end
 
 --[[