diff --git a/src/pg_rad/dataloader/dataloader.py b/src/pg_rad/dataloader/dataloader.py
index fd0a28a..dfe94a6 100644
--- a/src/pg_rad/dataloader/dataloader.py
+++ b/src/pg_rad/dataloader/dataloader.py
@@ -2,7 +2,7 @@ import logging
 
 import pandas as pd
 
-from pg_rad.exceptions import DataLoadError, InvalidCSVError
+from pg_rad.exceptions.exceptions import DataLoadError, InvalidCSVError
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/pg_rad/isotopes/isotope.py b/src/pg_rad/isotopes/isotope.py
index 78ac54e..5706acd 100644
--- a/src/pg_rad/isotopes/isotope.py
+++ b/src/pg_rad/isotopes/isotope.py
@@ -1,4 +1,4 @@
-from pg_rad.physics import get_mass_attenuation_coeff
+from pg_rad.physics.attenuation import get_mass_attenuation_coeff
 
 
 class Isotope:
diff --git a/src/pg_rad/landscape/director.py b/src/pg_rad/landscape/director.py
index edddd7f..4484092 100644
--- a/src/pg_rad/landscape/director.py
+++ b/src/pg_rad/landscape/director.py
@@ -2,9 +2,9 @@ from importlib.resources import files
 import logging
 
 from pg_rad.configs.filepaths import TEST_EXP_DATA
-from pg_rad.isotopes import CS137
+from pg_rad.isotopes.presets import CS137
 from pg_rad.landscape.landscape import LandscapeBuilder
-from pg_rad.objects import PointSource
+from pg_rad.objects.sources import PointSource
 
 
 class LandscapeDirector:
diff --git a/src/pg_rad/landscape/landscape.py b/src/pg_rad/landscape/landscape.py
index 805081e..3af4733 100644
--- a/src/pg_rad/landscape/landscape.py
+++ b/src/pg_rad/landscape/landscape.py
@@ -1,11 +1,10 @@
 import logging
 from typing import Self
 
-from pg_rad.dataloader import load_data
-from pg_rad.exceptions import OutOfBoundsError
-from pg_rad.objects import PointSource
-from pg_rad.path import Path, path_from_RT90
-from pg_rad.physics.fluence import phi_single_source
+from pg_rad.dataloader.dataloader import load_data
+from pg_rad.exceptions.exceptions import OutOfBoundsError
+from pg_rad.objects.sources import PointSource
+from pg_rad.path.path import Path, path_from_RT90
 
 logger = logging.getLogger(__name__)
 
@@ -44,23 +43,6 @@ class Landscape:
 
         logger.debug(f"Landscape created: {self.name}")
 
-    def calculate_fluence_at(self, pos: tuple):
-        total_phi = 0.
-        for source in self.point_sources:
-            r = source.distance_to(pos)
-            phi_source = phi_single_source(
-                r=r,
-                activity=source.activity,
-                branching_ratio=source.isotope.b,
-                mu_mass_air=source.isotope.mu_mass_air,
-                air_density=self.air_density
-            )
-            total_phi += phi_source
-        return total_phi
-
-    def calculate_fluence_along_path(self):
-        pass
-
 
 class LandscapeBuilder:
     def __init__(self, name: str = "Unnamed landscape"):
diff --git a/src/pg_rad/objects/sources.py b/src/pg_rad/objects/sources.py
index 9361f1f..7659704 100644
--- a/src/pg_rad/objects/sources.py
+++ b/src/pg_rad/objects/sources.py
@@ -1,7 +1,7 @@
 import logging
 
 from .objects import BaseObject
-from pg_rad.isotopes import Isotope
+from pg_rad.isotopes.isotope import Isotope
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/pg_rad/plotting/landscape_plotter.py b/src/pg_rad/plotting/landscape_plotter.py
index d54ca9a..9c6b589 100644
--- a/src/pg_rad/plotting/landscape_plotter.py
+++ b/src/pg_rad/plotting/landscape_plotter.py
@@ -3,7 +3,7 @@ import logging
 from matplotlib import pyplot as plt
 from matplotlib.patches import Circle
 
-from pg_rad.landscape import Landscape
+from pg_rad.landscape.landscape import Landscape
 
 logger = logging.getLogger(__name__)