Improve error handling. Add alignment feature for point sources

src/pg_rad/inputparser/specs.py

@@ -1,5 +1,6 @@
 from abc import ABC
 from dataclasses import dataclass
+from typing import Literal
 
 
 @dataclass
@@ -42,31 +43,32 @@ class CSVPathSpec(PathSpec):
 
 
 @dataclass
-class SourceSpec(ABC):
+class PointSourceSpec(ABC):
     activity_MBq: float
     isotope: str
     name: str
 
 
 @dataclass
-class AbsolutePointSourceSpec(SourceSpec):
+class AbsolutePointSourceSpec(PointSourceSpec):
     x: float
     y: float
     z: float
 
 
 @dataclass
-class RelativePointSourceSpec(SourceSpec):
+class RelativePointSourceSpec(PointSourceSpec):
     along_path: float
     dist_from_path: float
     side: str
     z: float
+    alignment: Literal["best", "worst"] | None
 
 
 @dataclass
 class DetectorSpec:
     name: str
-    eff: float | None
+    efficiency: float
     is_isotropic: bool
 
 
@@ -76,5 +78,5 @@ class SimulationSpec:
     runtime: RuntimeSpec
     options: SimulationOptionsSpec
     path: PathSpec
-    point_sources: list[SourceSpec]
+    point_sources: list[PointSourceSpec]
     detector: DetectorSpec