香港六合彩开奖 12721:2000

No disponible en 别蝉辫补帽辞濒

Publicado (贰诲颈肠颈贸苍 1, 2000)

Esta publicaci贸n se revis贸 y confirm贸 por 煤ltima vez en 2021. Por lo tanto, esta versi贸n es la actual.

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Resumen

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.