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GB/T 31362-2015: Non-destructive testing -- Thermal neutron radiographic testing -- Determination of beam L/D ratio
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Non-destructive testing -- Thermal neutron radiographic testing -- Determination of beam L/D ratio
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GB/T 31362-2015
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Basic data | Standard ID | GB/T 31362-2015 (GB/T31362-2015) | | Description (Translated English) | Non-destructive testing -- Thermal neutron radiographic testing -- Determination of beam L/D ratio | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 13,189 | | Date of Issue | 2015-02-04 | | Date of Implementation | 2015-10-01 | | Adopted Standard | ISO 12721-2000, IDT | | Regulation (derived from) | National Standards Bulletin 2015 No. 3 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies the determination of the thermal neutron radiography Neutron beam collimation ratio (L/D values ??between 20 and 1000) test technology. The technical analysis of neutron radiography imaging quality shadow region of the device based on zero whole, without measure and calculate the physical size of the collimator system. This Standard used by the device are converted into Gd foil screen and high-resolution single-sided film inside the vacuum cartridge is tested. | GB/T 31362-2015: Non-destructive testing -- Thermal neutron radiographic testing -- Determination of beam L/D ratio
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Non-destructive testing. Thermal neutron radiographic testing. Determination of beam L/D ratio
ICS 19.100
J04
National Standards of People's Republic of China
NDT Thermal neutron radiographic testing
Determination of neutron beam L/D ratio
(ISO 12721.2000, IDT)
Issued on. 2015-02-04
2015-10-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard uses the translation method identical with ISO 12721.2000 "Non-destructive testing thermal neutron radiography detected neutron beam L/D ratio
Determination. "
The standard non-destructive testing by the National Standardization Technical Committee (SAC/TC56) and focal points.
This standard was drafted. China Institute of Atomic Energy, Shanghai Research Institute of Materials, Haitai Division Inspection Technologies Ltd, China Engineering
Nuclear Physics Institute of Physics and Chemistry.
The main drafters of this standard. Chen Dongfeng, Han Songbo, Liu Yuntao, Wang Hongli, Wu Meimei, Weiguo Hai Tang Bin, Wang Yu, Helin Feng, Sun Kai,
Sun Yong, Hao Lijie, Liu Xiaolong, Li Yuqing, Jinyu Fei.
Introduction
This standard is intended to provide guidance to obtain reliable mass neutron radiography imaging data, and to help users determine heat-related
Neutron radiography device is suitable for a particular application.
NDT Thermal neutron radiographic testing
Determination of neutron beam L/D ratio
1 Scope
This standard specifies the determination of the thermal neutron radiography neutron beam collimation ratio (L/D values \u200b\u200bbetween 20 and 1000) test technique. The technology group
Analysis of image quality in neutron radiography Newtree shadow region of the device, without having to measure and calculate the physical size of the collimator system. This standard employed
The devices have been placed by Gd foil conversion screen and high-resolution single-sided film cartridge inside the vacuum tested.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Effective collimation than effectiveL/Dratio
One of the factors that determine the imaging resolution neutron radiography apparatus, the size of the inlet aperture and an effective imaging plane distance (L) and the inlet
The ratio of the effective aperture diameter (D) of.
Note. The actual measured L and D, L/D values \u200b\u200bcalculated with L/D values \u200b\u200bobtained by this method are different.
2.2
Full umbra shadow zone
In the shadow image, all of the original object beam is blocked region (like solar eclipse), see Figure 1.
Explanation.
1 --- beam;
2 --- object;
3 --- Full Movies region;
4 --- penumbra;
5 --- source.
Figure 1 Schematic drawing area Newtree Movies
2.3
Penumbra penumbra
In the shadow image, the initial part of the object beam is blocked region (hatched not determined sharpness), see Figure 1.
2.4
The initial beam primarybeam
Originating from the neutron source, until the effect of the object/detection system occurs, remains collimated neutron beam state.
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