Fix various type hints around the detector

[DominicOram]

Fixes #178

To test:

• Confirm test still pass and type errors are reduced

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (611d2bc) 42.91% compared to head (11f5cbc) 42.91%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #179   +/-   ##
=======================================
  Coverage   42.91%   42.91%           
=======================================
  Files          45       45           
  Lines        3887     3887           
  Branches      752      752           
=======================================
  Hits         1668     1668           
  Misses       2095     2095           
  Partials      124      124           

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[noemifrisina]

Looks good to me, thanks