diff --git a/fng_dose/neutron/generate_settings.py b/fng_dose/neutron/generate_settings.py
index 50df4b3b..c8abd821 100644
--- a/fng_dose/neutron/generate_settings.py
+++ b/fng_dose/neutron/generate_settings.py
@@ -5,32 +5,41 @@
 import openmc
 import openmc.stats
 
+# Take discrete values and create intervals that cover [-1, 1]
 cos_theta = np.array([
     1.00000, 0.98481, 0.93969, 0.86603, 0.76604, 0.64279, 0.50000, 0.34202,
     0.17365, 0.00000, -0.17365, -0.34202, -0.50000, -0.64279, -0.76604,
     -0.86603, -0.93969, -0.98481, -1.00000
 ])
+cos_theta = np.concatenate([[1.], cos_theta[:-1] + 0.5*np.diff(cos_theta), [-1.]])
 
+# Weight relative intensity by width of corresponding cos_theta intervals
 relative_intensity = np.array([
   1.05459, 1.05374, 1.05124, 1.04715, 1.04162, 1.03484, 1.02701, 1.01842,
   1.00932, 1.00000, 0.99075, 0.98184, 0.97354, 0.96609, 0.95969, 0.95452,
   0.95073, 0.94842, 0.94764
 ])
+relative_intensity *= np.diff(-cos_theta)
 
 yield_data = np.loadtxt('yields.txt')
 yields = []
-for i in range(cos_theta.size):
+for i in range(relative_intensity.size):
     yields.append(
         openmc.stats.Tabular(1e6*yield_data[:, 2*i], yield_data[:, 2*i+1])
     )
 
 sources = []
-for i in range(cos_theta.size):
-    mu_dist = openmc.stats.Discrete([cos_theta[i]], [1.0])
+for i, (mu_high, mu_low) in enumerate(zip(cos_theta[:-1], cos_theta[1:])):
+    mu_dist = openmc.stats.Uniform(mu_low, mu_high)
     phi_dist = openmc.stats.Uniform(0., 2*pi)
-    angle_dist = openmc.stats.PolarAzimuthal(mu_dist, phi_dist)
+    angle_dist = openmc.stats.PolarAzimuthal(
+        mu_dist,
+        phi_dist,
+        reference_uvw=(0.0, 1.0, 0.0),
+    )
     energy_dist = yields[i]
 
+    # Create sources so that strengths add up to 1
     source = openmc.Source(
         angle=angle_dist,
         energy=energy_dist,
@@ -38,7 +47,6 @@
     )
     sources.append(source)
 
-
 settings = openmc.Settings()
 settings.run_mode = 'fixed source'
 settings.particles = 10_000
diff --git a/fng_dose/neutron/settings.xml b/fng_dose/neutron/settings.xml
index d7c16890..9f995e4f 100644
--- a/fng_dose/neutron/settings.xml
+++ b/fng_dose/neutron/settings.xml
@@ -3,209 +3,171 @@
   <run_mode>fixed source</run_mode>
   <particles>10000</particles>
   <batches>100</batches>
-  <source strength="0.05547218342919812">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>1.0 1.0</parameters>
-      </mu>
+  <source strength="0.004003302071996223">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.992405 1.0" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14316700.0 14359900.0 14398300.0 14433400.0 14465800.0 14496200.0 14524900.0 14552200.0 14578300.0 14603400.0 14627600.0 14651000.0 14673700.0 14695700.0 14717100.0 14738000.0 14758400.0 14778400.0 14797900.0 14817000.0 14835800.0 14854300.0 14872400.0 14890200.0 14907700.0 14925000.0 14942000.0 14958800.0 14975300.0 14991700.0 15007800.0 15023700.0 15039500.0 15055000.0 15070400.0 15085600.0 15100700.0 15115600.0 15130400.0 15145000.0 15159500.0 15173800.0 15188000.0 15202100.0 0.00042 0.00072 0.00184 0.00278 0.00485 0.00671 0.00966 0.0124 0.01593 0.01926 0.02283 0.02625 0.02912 0.0319 0.03406 0.03615 0.03707 0.03798 0.03792 0.03786 0.03708 0.0363 0.03523 0.03417 0.0328 0.03143 0.03039 0.02934 0.02793 0.0265 0.02542 0.02434 0.02319 0.02203 0.02112 0.02019 0.01951 0.01883 0.01805 0.01727 0.01669 0.01609 0.0155 0.01489</parameters>
     </energy>
   </source>
-  <source strength="0.055427472825157864">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.98481 1.0</parameters>
-      </mu>
+  <source strength="0.015881800388645197">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.96225 0.992405" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14312700.0 14355200.0 14393100.0 14427600.0 14459600.0 14489500.0 14517800.0 14544700.0 14570500.0 14595200.0 14619000.0 14642100.0 14664400.0 14686100.0 14707200.0 14727800.0 14748000.0 14767600.0 14786900.0 14805700.0 14824200.0 14842400.0 14860300.0 14877900.0 14895100.0 14912200.0 14928900.0 14945500.0 14961800.0 14977900.0 14993800.0 15009500.0 15025000.0 15040400.0 15055500.0 15070500.0 15085400.0 15100100.0 15114600.0 15129100.0 15143300.0 15157500.0 15171500.0 15185400.0 0.00042 0.00072 0.00184 0.00278 0.00485 0.00671 0.00966 0.0124 0.01594 0.01926 0.02283 0.02626 0.02913 0.0319 0.03406 0.03615 0.03708 0.03798 0.03793 0.03786 0.03708 0.0363 0.03523 0.03417 0.03279 0.03143 0.03039 0.02934 0.02792 0.0265 0.02542 0.02434 0.02318 0.02203 0.02111 0.02019 0.01951 0.01883 0.01805 0.01727 0.01668 0.01609 0.01549 0.01489</parameters>
     </energy>
   </source>
-  <source strength="0.055295971048568864">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.93969 1.0</parameters>
-      </mu>
+  <source strength="0.031204852716926534">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.90286 0.96225" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14300700.0 14341400.0 14377500.0 14410500.0 14441100.0 14469700.0 14496700.0 14522500.0 14547100.0 14570800.0 14593600.0 14615600.0 14637000.0 14657700.0 14678000.0 14697700.0 14716900.0 14735700.0 14754200.0 14772200.0 14789900.0 14807300.0 14824400.0 14841200.0 14857800.0 14874100.0 14890200.0 14906000.0 14921600.0 14937000.0 14952300.0 14967300.0 14982200.0 14996900.0 15011400.0 15025800.0 15040000.0 15054100.0 15068000.0 15081800.0 15095500.0 15109100.0 15122500.0 15135800.0 0.00042 0.00072 0.00185 0.00278 0.00485 0.00672 0.00967 0.01241 0.01595 0.01927 0.02285 0.02627 0.02914 0.03192 0.03407 0.03616 0.03709 0.03799 0.03793 0.03787 0.03709 0.03631 0.03523 0.03416 0.03279 0.03142 0.03038 0.02934 0.02792 0.02649 0.02541 0.02433 0.02317 0.02202 0.0211 0.02018 0.0195 0.01881 0.01804 0.01726 0.01667 0.01607 0.01548 0.01488</parameters>
     </energy>
   </source>
-  <source strength="0.05508083414206926">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.86603 1.0</parameters>
-      </mu>
+  <source strength="0.04544233336015503">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.8160350000000001 0.90286" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14281100.0 14318700.0 14352100.0 14382600.0 14410900.0 14437400.0 14462400.0 14486300.0 14509000.0 14530900.0 14552100.0 14572500.0 14592300.0 14611500.0 14630300.0 14648500.0 14666400.0 14683800.0 14700900.0 14717600.0 14734100.0 14750200.0 14766100.0 14781700.0 14797000.0 14812100.0 14827000.0 14841700.0 14856200.0 14870500.0 14884700.0 14898600.0 14912400.0 14926100.0 14939600.0 14952900.0 14966100.0 14979200.0 14992200.0 15005000.0 15017700.0 15030300.0 15042800.0 15055200.0 0.00043 0.00072 0.00185 0.00279 0.00486 0.00673 0.00969 0.01243 0.01597 0.0193 0.02287 0.0263 0.02917 0.03194 0.0341 0.03618 0.03711 0.03801 0.03795 0.03788 0.03709 0.03631 0.03523 0.03416 0.03279 0.03142 0.03037 0.02932 0.02791 0.02647 0.0254 0.02431 0.02316 0.022 0.02108 0.02016 0.01948 0.01879 0.01802 0.01724 0.01665 0.01605 0.01546 0.01486</parameters>
     </energy>
   </source>
-  <source strength="0.054789952212254384">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.76604 1.0</parameters>
-      </mu>
+  <source strength="0.05811098843088687">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.704415 0.8160350000000001" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14254600.0 14288000.0 14317800.0 14344900.0 14370100.0 14393700.0 14416000.0 14437200.0 14457500.0 14477100.0 14495900.0 14514200.0 14531800.0 14549000.0 14565700.0 14582100.0 14598000.0 14613600.0 14628900.0 14643900.0 14658600.0 14673000.0 14687200.0 14701200.0 14714900.0 14728500.0 14741800.0 14755000.0 14768000.0 14780800.0 14793400.0 14806000.0 14818300.0 14830600.0 14842700.0 14854600.0 14866500.0 14878200.0 14889800.0 14901400.0 14912800.0 14924100.0 14935300.0 14946400.0 0.00043 0.00073 0.00186 0.0028 0.00488 0.00675 0.00971 0.01245 0.016 0.01933 0.02291 0.02633 0.0292 0.03198 0.03413 0.03621 0.03713 0.03803 0.03796 0.03789 0.0371 0.03631 0.03523 0.03416 0.03278 0.03141 0.03036 0.02931 0.02789 0.02646 0.02538 0.02429 0.02313 0.02198 0.02106 0.02014 0.01945 0.01877 0.01799 0.01721 0.01662 0.01603 0.01543 0.01483</parameters>
     </energy>
   </source>
-  <source strength="0.05443331939414501">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.64279 1.0</parameters>
-      </mu>
+  <source strength="0.06880136982367831">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.571395 0.704415" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14222000.0 14250300.0 14275500.0 14298500.0 14319900.0 14339900.0 14358900.0 14377000.0 14394300.0 14411000.0 14427000.0 14442600.0 14457700.0 14472300.0 14486600.0 14500600.0 14514200.0 14527500.0 14540600.0 14553400.0 14566000.0 14578400.0 14590600.0 14602500.0 14614300.0 14625900.0 14637400.0 14648700.0 14659800.0 14670900.0 14681700.0 14692500.0 14703100.0 14713600.0 14724000.0 14734300.0 14744500.0 14754600.0 14764600.0 14774600.0 14784400.0 14794100.0 14803800.0 14813400.0 0.00043 0.00073 0.00186 0.00281 0.00489 0.00676 0.00973 0.01248 0.01603 0.01937 0.02295 0.02637 0.02925 0.03202 0.03417 0.03625 0.03716 0.03805 0.03798 0.03791 0.03711 0.03632 0.03523 0.03415 0.03277 0.0314 0.03035 0.02929 0.02787 0.02643 0.02535 0.02427 0.02311 0.02195 0.02103 0.02011 0.01942 0.01874 0.01796 0.01718 0.01659 0.01599 0.0154 0.0148</parameters>
     </energy>
   </source>
-  <source strength="0.05402145582986826">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.5 1.0</parameters>
-      </mu>
+  <source strength="0.07719445879704663">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.42101 0.571395" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14184300.0 14206700.0 14226700.0 14245000.0 14262000.0 14277900.0 14293100.0 14307500.0 14321400.0 14334700.0 14347600.0 14360100.0 14372200.0 14384000.0 14395500.0 14406700.0 14417700.0 14428500.0 14439000.0 14449400.0 14459500.0 14469500.0 14479400.0 14489100.0 14498600.0 14508000.0 14517300.0 14526500.0 14535600.0 14544500.0 14553400.0 14562100.0 14570800.0 14579300.0 14587800.0 14596200.0 14604500.0 14612700.0 14620900.0 14629000.0 14637000.0 14645000.0 14652900.0 14660700.0 0.00043 0.00073 0.00187 0.00282 0.00491 0.00679 0.00976 0.01252 0.01607 0.01941 0.023 0.02642 0.0293 0.03207 0.03421 0.03629 0.0372 0.03808 0.03801 0.03792 0.03712 0.03632 0.03523 0.03415 0.03276 0.03138 0.03033 0.02927 0.02784 0.02641 0.02532 0.02424 0.02307 0.02192 0.021 0.02007 0.01939 0.0187 0.01792 0.01714 0.01655 0.01595 0.01536 0.01476</parameters>
     </energy>
   </source>
-  <source strength="0.05356961572550845">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.34202 1.0</parameters>
-      </mu>
+  <source strength="0.08305914861887044">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.257835 0.42101" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14142700.0 14158600.0 14172900.0 14185900.0 14198200.0 14209700.0 14220600.0 14231100.0 14241100.0 14250800.0 14260200.0 14269300.0 14278200.0 14286900.0 14295300.0 14303600.0 14311700.0 14319600.0 14327400.0 14335100.0 14342600.0 14350100.0 14357400.0 14364600.0 14371700.0 14378700.0 14385700.0 14392500.0 14399300.0 14406000.0 14412600.0 14419200.0 14425700.0 14432100.0 14438500.0 14444800.0 14451100.0 14457300.0 14463500.0 14469600.0 14475700.0 14481700.0 14487700.0 14493600.0 0.00043 0.00074 0.00188 0.00283 0.00493 0.00681 0.0098 0.01255 0.01612 0.01946 0.02305 0.02648 0.02935 0.03212 0.03426 0.03633 0.03724 0.03812 0.03803 0.03794 0.03713 0.03633 0.03523 0.03414 0.03275 0.03137 0.03031 0.02925 0.02782 0.02638 0.02529 0.0242 0.02304 0.02188 0.02096 0.02003 0.01935 0.01866 0.01788 0.0171 0.01651 0.01591 0.01531 0.01471</parameters>
     </energy>
   </source>
-  <source strength="0.053090949258724485">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.17365 1.0</parameters>
-      </mu>
+  <source strength="0.08626950780812348">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="0.086825 0.257835" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14098500.0 14107500.0 14115700.0 14123300.0 14130500.0 14137300.0 14143800.0 14150000.0 14156100.0 14162000.0 14167700.0 14173300.0 14178700.0 14184100.0 14189300.0 14194500.0 14199500.0 14204500.0 14209400.0 14214300.0 14219100.0 14223800.0 14228500.0 14233100.0 14237600.0 14242200.0 14246600.0 14251100.0 14255500.0 14259800.0 14264100.0 14268400.0 14272700.0 14276900.0 14281100.0 14285300.0 14289400.0 14293500.0 14297600.0 14301600.0 14305700.0 14309700.0 14313700.0 14317600.0 0.00044 0.00074 0.00189 0.00284 0.00495 0.00684 0.00983 0.0126 0.01617 0.01951 0.02311 0.02654 0.02941 0.03218 0.03432 0.03638 0.03728 0.03815 0.03806 0.03796 0.03715 0.03633 0.03523 0.03414 0.03274 0.03135 0.03029 0.02922 0.02779 0.02635 0.02526 0.02417 0.023 0.02184 0.02092 0.01999 0.0193 0.01861 0.01783 0.01705 0.01646 0.01586 0.01527 0.01467</parameters>
     </energy>
   </source>
-  <source strength="0.052600710635600685">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>0.0 1.0</parameters>
-      </mu>
+  <source strength="0.08679240483245966">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="-0.086825 0.086825" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14053100.0 14055000.0 14057000.0 14059000.0 14061000.0 14063000.0 14065000.0 14067000.0 14068900.0 14070900.0 14072900.0 14074900.0 14076900.0 14078900.0 14080800.0 14082800.0 14084800.0 14086800.0 14088800.0 14090800.0 14092700.0 14094700.0 14096700.0 14098700.0 14100700.0 14102700.0 14104600.0 14106600.0 14108600.0 14110600.0 14112600.0 14114600.0 14116500.0 14118500.0 14120500.0 14122500.0 14124500.0 14126500.0 14128500.0 14130400.0 14132400.0 14134400.0 14136400.0 14138400.0 0.00044 0.00074 0.0019 0.00286 0.00497 0.00687 0.00987 0.01264 0.01622 0.01957 0.02317 0.0266 0.02947 0.03224 0.03437 0.03643 0.03732 0.03819 0.03809 0.03798 0.03716 0.03634 0.03523 0.03413 0.03273 0.03133 0.03026 0.0292 0.02776 0.02631 0.02522 0.02413 0.02296 0.0218 0.02088 0.01995 0.01926 0.01857 0.01779 0.01701 0.01641 0.01582 0.01522 0.01462</parameters>
     </energy>
   </source>
-  <source strength="0.05211415406222138">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>-0.17365 1.0</parameters>
-      </mu>
+  <source strength="0.08468227604812978">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="-0.257835 -0.086825" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
     </angle>
     <energy interpolation="linear-linear" type="tabular">
       <parameters>14007800.0 14002800.0 13998600.0 13995000.0 13991900.0 13989100.0 13986600.0 13984300.0 13982300.0 13980400.0 13978700.0 13977200.0 13975700.0 13974400.0 13973200.0 13972000.0 13971000.0 13970000.0 13969100.0 13968300.0 13967500.0 13966800.0 13966200.0 13965600.0 13965000.0 13964500.0 13964100.0 13963700.0 13963300.0 13962900.0 13962600.0 13962400.0 13962100.0 13961900.0 13961700.0 13961600.0 13961500.0 13961400.0 13961300.0 13961300.0 13961300.0 13961300.0 13961300.0 13961300.0 0.00044 0.00075 0.00191 0.00287 0.00499 0.00689 0.0099 0.01268 0.01627 0.01963 0.02323 0.02666 0.02953 0.0323 0.03443 0.03648 0.03737 0.03823 0.03812 0.03801 0.03717 0.03635 0.03523 0.03412 0.03271 0.03131 0.03024 0.02917 0.02773 0.02628 0.02519 0.02409 0.02292 0.02176 0.02083 0.0199 0.01921 0.01852 0.01774 0.01696 0.01637 0.01577 0.01517 0.01457</parameters>
     </energy>
   </source>
-  <source strength="0.05164548173045818">
-    <angle reference_uvw="0.0 0.0 1.0" type="mu-phi">
-      <mu type="discrete">
-        <parameters>-0.34202 1.0</parameters>
-      </mu>
+  <source strength="0.08007579827571311">
+    <angle reference_uvw="0.0 1.0 0.0" type="mu-phi">
+      <mu parameters="-0.42101 -0.257835" type="uniform" />
       <phi parameters="0.0 6.283185307179586" type="uniform" />
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