Embodiments of the invention provide novel, industrially applicable, and non-obvious apparatus and methods for automatically, routinely, and accurately calibrating a trace detection portal. Embodiments of the apparatus include a calibrant container; a substance (or substances) uniquely identifiable by...http://www.google.es/patents/US7594422?utm_source=gb-gplus-sharePatente US7594422 - Apparatus and method for calibrating a trace detection portal
Apparatus and method for calibrating a trace detection portal
