TY - JOUR AU - Wu, Z AU - Inn, Kenneth AU - Lin, Z AU - McMahon, C AU - Karam, Lisa C2 - Applied Radiation and Isotopes DA - 2002-01-01 00:01:00 LA - en M1 - 56 PB - Applied Radiation and Isotopes PY - 2002 TI - NIST Radiochemistry Intercomparison Program: a Summary of Four-year Performance Evaluation Study ER -