TY  - RPRT
TI  - Calibration of beta-particle radiation instrumentation and sources 
AU  - Pruitt, John S
AU  - Soares, Christopher G
AU  - Ehrlich, Margarete
PY  - 1988
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 250-21
DO  - 10.6028/NBS.SP.250-21
ER  -