TY  - RPRT
TI  - Ampoules for radioactivity standard reference materials 
AU  - Colle, Ronald
PY  - 2019
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 8254
DO  - 10.6028/NIST.IR.8254
ER  -