ISO 12721:2000

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SO 12721:2000 is an International Standard that details a method for determining the L/D (Length/Diameter) ratio of thermal neutron radiography beams. This ratio is crucial in neutron radiography, a non-destructive testing technique, as it influences the image quality and ability to detect flaws. The standard provides an empirical technique based on analyzing the radiographic image itself, independent of direct measurements, to determine the effective collimation and L/D for beam values between 20 and 1000.