TY  - RPRT
TI  - The National Measurement System for ionizing radiations 
AU  - Caswell, Randall S
PY  - 1978
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 75-946
DO  - 10.6028/NBS.IR.75-946
ER  -