Moves non-physical input check outsode I/O module

.mailmap

@@ -215,6 +215,8 @@ Stuart Sim <[email protected]> ssim <[email protected]>
 Stuart Sim <[email protected]> Stuart Sim <[email protected]>
 Stuart Sim <[email protected]> Stuart Sim <[email protected]>
 
+Swayam Shah <[email protected]> Sonu0305 <[email protected]>
+
 TARDIS Bot <[email protected]>
 TARDIS Bot <[email protected]> tardis-bot <[email protected]>
 TARDIS Bot <[email protected]> TARDIS Bot <[email protected]>

tardis/io/model/parse_radiation_field_configuration.py

@@ -8,6 +8,7 @@
     parse_structure_from_config,
 )
 from tardis.plasma.radiation_field import DilutePlanckianRadiationField
+from tardis.radiation_field.validate_radiation_field import validate_radiative_temperature
 
 logger = logging.getLogger(__name__)
 
@@ -113,12 +114,7 @@ def parse_radiation_field_state_from_csvy(
             geometry, packet_source
         )
 
-    if np.any(t_radiative < 1000 * u.K):
-        logging.critical(
-            "Radiative temperature is too low in some of the shells, temperatures below 1000K "
-            f"(e.g., T_rad = {t_radiative[np.argmin(t_radiative)]} in shell {np.argmin(t_radiative)} in your model) "
-            "are not accurately handled by TARDIS.",
-        )
+    validate_radiative_temperature(t_radiative)
 
     if hasattr(csvy_model_data, "columns") and (
         "dilution_factor" in csvy_model_data.columns

tardis/radiation_field/validate_radiation_field.py

@@ -0,0 +1,31 @@
+import logging
+import numpy as np
+from astropy import units as u
+
+logger = logging.getLogger(__name__)
+
+def validate_radiative_temperature(t_radiative):
+    """
+    Validates the radiative temperature to ensure it is physically reasonable.
+
+    Parameters
+    ----------
+    t_radiative : Quantity
+        The radiative temperature array.
+
+    Raises
+    ------
+    ValueError
+        If any radiative temperature is below 1000 K.
+    """
+    if np.any(t_radiative < 1000 * u.K):
+        min_t_rad = t_radiative[np.argmin(t_radiative)]
+        min_shell = np.argmin(t_radiative)
+        logging.critical(
+            "Radiative temperature is too low in some of the shells, temperatures below 1000K "
+            f"(e.g., T_rad = {min_t_rad} in shell {min_shell} in your model) "
+            "are not accurately handled by TARDIS."
+        )
+        raise ValueError(
+            f"Radiative temperature below 1000 K detected: T_rad = {min_t_rad} in shell {min_shell}."
+        )