TY  - RPRT
TI  - Graphical solution for the helium leak detector and radioisotope methods of hermetic test 
AU  - Ruthberg, Stanley
PY  - 1982
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 400-73
DO  - 10.6028/NBS.SP.400-73
ER  -