🐛 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 64.51613% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.14%. Comparing base (25b9f07) to head (439cbc9).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/physics/impurity_radiation.py	64.28%	10 Missing ⚠️
process/models/physics/physics.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4219      +/-   ##
==========================================
+ Coverage   52.10%   52.14%   +0.04%     
==========================================
  Files         148      148              
  Lines       30389    30434      +45     
==========================================
+ Hits        15835    15871      +36     
- Misses      14554    14563       +9     

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