diff --git a/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 6.md b/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 6.md
index b9f6c75c4..a101d55dc 100644
--- a/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 6.md	
+++ b/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 6.md	
@@ -1,4 +1,10 @@
+# Experiment 6.1 
 137Ce Measured at 5.2 microcurie
 Started at 6:47:50 stopped at 6:51:06
 Elapsed live time 193.92s
 Gross area 35331 $\Sigma_{U1}$
+
+Background elapsed live time 193.94s
+$\Sigma_b = 558$
+
+# Experiment 6.3