diff --git a/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md b/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md
index 0b2d6153..d91fa08c 100644
--- a/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md	
+++ b/300s School/NUCE 2113 - Radiation Detection and Measurement/Laboratory 3.md	
@@ -47,5 +47,45 @@ measurements in script
 
 removing both halves
 background count is 32
+```
+danesabo@danesabo-laptop:~/Projects/class_work/NUCE_2113$ python3 quick_maths.py 
+t_d = 2.362e-04
+perc deadtime =11.401
+t_d = 2.115e-04
+perc deadtime =10.317
+
+danesabo@danesabo-laptop:~/Projects/class_work/NUCE_2113$ cat quick_maths.py 
+#rad disk
+R_1=15460
+R_12 = 28966
+R_2 = 15257
+R_b = 0
+
+X = R_1*R_2 - R_b*R_12
+Y = R_1*R_2*(R_12+R_b) - R_b*R_12*(R_1+R_2)
+Z = Y*(R_1+R_2 - R_12-R_b)/X**2
+T_d = X*(1-(1-Z)**(1/2))/Y *60
+
+
+print(f't_d = {T_d:.3e}')
+#Exercise 3.1
+print(f'perc deadtime ={T_d*R_12/60*100:.3f}')
+
+#blank disk
+R_1=15280
+R_12 = 29273
+R_2 = 15585
+R_b = 0
+
+X = R_1*R_2 - R_b*R_12
+Y = R_1*R_2*(R_12+R_b) - R_b*R_12*(R_1+R_2)
+Z = Y*(R_1+R_2 - R_12-R_b)/X**2
+T_d = X*(1-(1-Z)**(1/2))/Y *60
+
+print(f't_d = {T_d:.3e}')
+#Exercise 3.1
+print(f'perc deadtime ={T_d*R_12/60*100:.3f}')
+
+```
 
 - [x] make tasks for what needs done for this #NUCE2113 ⏳ 2025-02-05 📅 2025-02-05 ✅ 2025-02-10
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