Add background counts for 3x3 inch NaI. Add auto ROI lookup function from the FWHM. Add ROI test.

tests/test_roi.py

@@ -0,0 +1,42 @@
+import pytest
+
+from pg_rad.background.background import get_roi_from_fwhm, get_cps_from_roi
+from pg_rad.detector.detector import load_detector
+
+E_gamma = 661.7  # keV
+
+
+@pytest.fixture
+def detector():
+    return load_detector("LU_NaI_3inch")
+
+
+@pytest.fixture
+def roi_Cs137_NaI(detector):
+    return get_roi_from_fwhm(detector, E_gamma)
+
+
+@pytest.mark.parametrize("ref_roi_lo, ref_roi_hi", [
+    (537.58, 792.69)
+])
+def test_roi_acquisition_Cs137_NaI(ref_roi_lo, ref_roi_hi, roi_Cs137_NaI):
+    """Test against ROI used in GammaVision"""
+    est_roi_lo, est_roi_hi = roi_Cs137_NaI
+
+    assert pytest.approx(est_roi_lo, rel=0.05) == ref_roi_lo
+    assert pytest.approx(est_roi_hi, rel=0.05) == ref_roi_hi
+
+
+@pytest.mark.parametrize("ref_cps", [
+    13.61
+])
+def test_cps_acquisition_Cs137_NaI(
+    ref_cps,
+    roi_Cs137_NaI,
+    detector
+):
+    """Test against cps from GammaVision"""
+    est_roi_lo, est_roi_hi = roi_Cs137_NaI
+    est_cps = get_cps_from_roi(detector, est_roi_lo, est_roi_hi)
+
+    assert pytest.approx(est_cps, rel=0.1) == ref_cps