TY  - RPRT
TI  - Gamma-ray emitting test sources for portal monitors used for homeland security 
AU  - Karam, Lisa R
AU  - Pibida, Leticia
AU  - Unterweger, Michael P
AU  - Lucas, Larry L
PY  - 2004
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 1460
DO  - 10.6028/NIST.TN.1460
ER  -