🐛 Line brem profile bug

[chris-ashe]

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 55.88235% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.85%. Comparing base (d587ca8) to head (e4e975a).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/physics/impurity_radiation.py	56.25%	14 Missing ⚠️
process/models/physics/physics.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4219      +/-   ##
==========================================
- Coverage   48.86%   48.85%   -0.01%     
==========================================
  Files         151      151              
  Lines       29461    29468       +7     
==========================================
+ Hits        14397    14398       +1     
- Misses      15064    15070       +6     

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