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ISO 12721:2000

Non-destructive testing — Thermal neutron radiographic testing — Determination of beam L/D ratio

Apr 6, 2000

General information

90.20     Apr 15, 2026

ISO

ISO/TC 135/SC 5

International Standard

19.100  

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Scope

This International Standard defines an empirical technique for the measurement of the effective collimation ratio
and effective L/D of thermal neutron radiography beams for values between 20 and 1 000. The technique is based
upon analysis of a neutron radiographic image and is independent of measurements and calculations based on
physical dimensions of the collimator system. The device described in this International Standard has been
developed and tested using Gd foil converters with a single emulsion, high resolution film in vacuum cassettes.

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NOW

PUBLISHED
ISO 12721:2000
90.20 Standard under periodical review
Apr 15, 2026

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