ECA-TEP-109-1981.pdf
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1、E I A TEPIOS BI m 3234b00 O007440 8 m OCTOBER 1981 7 TEST CRITERIA . FOR X-RAY IMAGE INTENSIFIER TUBES FORMULATED BY EIA TUBE ENGINEERING PANEL ADVISORY COUNCIL (TEPAC) TEPAC PUBLICATION No. 109 (Revision of TEPAC Suggested Standard No. 9) Copyright Electronic Components, Assemblies & Materials Asso
2、ciation Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 00:31:01 MDTNo reproduction or networking permitted without license from IHS -,-,- E I A TEP307 83 W 3234600 0007443 T NOTICE EIA Engineering Standards and Publications are
3、designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitatirig interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existe
4、nce of such Standards and Publications shall not in any respect preclude any member or non-member of EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of auch Standards and Publications preclude their voluntary use by those other th
5、an EIA members, whether the standard is to be used either domestically or internationally. Recommended Standards and Publications are adopted by EIA without regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume any liabi
6、lity to any patent owner, nor does it assume any obligation whatever to parties adopting the Recom- mended Standard or Publication. This document has been developed to recommend a standardized method of measurement of x-radiation from CRTS for tube manufacturer compliance with HHS Bureau of Radiolog
7、ical Health Regulations on this subject, Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W. Washington, D.C. 20006 .- PRICE: $5.50 Printed in U.S.A. Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Lic
8、ensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 00:31:01 MDTNo reproduction or networking permitted without license from IHS -,-,- c- -. E I A TEPLOS BL m 3234b00 00074i.12 L m TEPAC Publication No. 109 Paragraph 1.0 2, o 3.0 4 . 0 FIGURE 1 : FIGURE 2 : FIGURE 3: FIGURE
9、4: FIGURE 5: FIGURE 6: FIGURE 7: FIGURE 8: FIGURE 9: FIGURE 10: FIGURE 1 1 : APPENDIX I: APPENDIX I I : TEST CRITERIA FOR X-RAY IMAGE INTENSIFIER TUBES TABLE OF CONTENTS Purpose and Scope Definitions . Measurements Conversion Factor Useful Area and Field Diameter Useful Area (Calculated) X-Ray Test
10、Resolution Chart Radiation Meacuremen t Se t-Up Resolving Power Measurement Set-up Resolving Power Test Plot Contrast Test Phantom Radiation Measurement Set-up Contrast Measurement Set-up Radiation Measurement Set-up Output Screen Brightness Page 2 2 3 5 7 7 0 9 9 10 1 1 12 12 13 13 14 15 -1- - / Co
11、pyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 00:31:01 MDTNo reproduction or networking permitted without license from IHS -,-,- EIA TEPLOS 81 m 3234600 0007443
12、3 m I - TEST CRITERIA FOR X-RAY IMAGE INTENSIFIER TUBES EIA/TEPAC PUBLICATION NO. 109 PREFACE The material herein was developed b y the JT-4 Committee on Photosensitive Electron Tubes and previously issued in the form of a JEDEC suggested Standard entitled “Test Standard for X-Ray Image Intensifier
13、Tubes“ (JEDEC Suggested Standard No. 9, dated March 1969). a The document was transferred to the JT-20 Committee on Electro-Optic Devices who reaffirmed the publication for distribution under the cognizance of the EIA Tube Engineering Panel Advisory Council (TEPAC) as TEPAC Pub1 ication No. 109. Cop
14、yright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 00:31:01 MDTNo reproduction or networking permitted without license from IHS -,-,- E I A TEPLOS 81 = 3234b00 O007444
15、 5 1.0 1.1 2.0 O 2.1 2.2 2.3 2.4 2.5 TEST CRITERIA FOR X-RAY IMAGE INTENSIFIER TUBES Purpose and Scope .- This document provides recommended test methods for the measurement and ratings of X-ray image intensifier tubes. CAUTION: SAFETY CONSIDERATIONS Measuring instruments should be properZy grounded
16、. Cau-bion should be -taken to avoid shock hazard, particularly i n the vicinity of the anode connection and the voltage metering systems, . ment procedue. Safety glasses -should be worn at al2 times during the measure- X-ray f i l m badga skould be worn i n accordance with estabZishsd plant safety
17、practices for mon%torZng radiation dosage. Defini ti ons . . . X-ray Image Intensifier Tube - A vacuum tube containing an input screen which converts an X-ray pattern into an electron pattern and i n which the electrons are accelerated and focused on to an output screen which converts the electron p
18、attern into a light image of brightness greater than that of a fluoroscope screen, Useful Area - The area of the input plane enclosed by a circle having a radius over which the resolution is specified (see Fig.1). Useful Field Diameter - The diameter of the X-ray beam, measured at the location of th
19、e object, which produces an X-ray shadow covering the useful area (see Fig. 1). Image Quality - The faithfulness of the reproduction of an X-ray pattern (see definitions 2.8 and 2.9). Input Screen - The surface, either flat or curved, i n which X-radiation i s absorbed and in which the X-ray image i
20、s converted into either an image o f fluorescent light or of electric charge. Copyright Electronic Components, Assemblies & Materials Association Provided by IHS under license with ECA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 00:31:01 MDTNo reproduction or netw
21、orking permitted without license from IHS -,-,- E I A TEPLOS BL m 3234600 0007445 7 m 2.6 2.7 2.8 2.9 2.10 3. O 3.1 3.1.1 3.1.2 3.1.3 Output Screen - The surface in which is located the phosphor which 9 displays a light image. Conversion Factor - The quotient of the brightness in foot lamberts (or c
22、andelas/m2) a t the output screen by the input radiation i n mR/minute. The P number phosphor of the output screen and the quality of the input radiation must be specified. 1 candela/m2 = 0.2919 foot lambert. 1 foot lambert = 3.426 candela/m2. Maximum Resolving Power - The number o f space and bar c
23、ombinations per c m (inch) of high x-ray contrast a t the entrance plane such that the bars still can be discerned visually as separate entities a t the output screen. Minimum Visible Contrast - The difference i n thickness of the X-ray absorption fil ter expressed as a percentage of the maximum thi
24、ck- ness that produces a perceptible difference in brightness on the output screen a t a specified exposure rate (see Fig. 7). The Entrance Plane - The plane i n front of the input screen, through which, according to the specifications of -the manufacturer, no part of the image intensifier will prot
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