This paper examines special features arising in the measurement of atmosphe
ric C-14 monoxide. A detailed error analysis of the (CO)-C-14 method includ
ing sampling, chemical processing and AMS measurement of samples, standards
and blanks is given. Problems regarding the term "percent Modern Carbon (p
MC)" are discussed, and the conversion of PMC values to atmospheric (CO)-C-
14 concentrations is explained. (C) 2000 Elsevier Science B.V. All rights r
eserved.