Spectra simulated using GADRAS-DRF, with a 6.6 cm diameter equivalent detector face, and depth of 4 cm.  
An outside scattering environment was used, with the detector at a height of 1m.
Background is estimated for Livermore Ca.
Background: 1800s
241Am,50uC @50cm, 600s
109Cd,50uC @50cm, 600s
57Co,50uC @50cm, 600s
133Ba,50uC @50cm, 600s
137Cs,50uC @50cm, 600s
Co60,50uC @50cm, 600s
Na22,50uC @50cm, 600s
U232,50uC @50cm, 600s