Some standard content:
Chemical Industry Standard of the People's Republic of China
HG / T 2536 -- 93
Medical Computed Tomography Film
Issued on 1993-09-06
Ministry of Chemical Industry of the People's Republic of China
Implementation on 1994-07-01
Chemical Industry Standard of the People's Republic of China
Medical Computed Tomography Film
Subject Content and Scope of Application
HG/ T 2536 — 93
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking and storage and transportation conditions of medical computed tomography film.
This standard applies to medical computed tomography film with a blue polyester base as the support, an orthochromatic silver halide emulsion coated on the front and an anti-halation layer coated on the back.
2 Reference standards
GB/T6843 Determination of melting point of coating on photosensitive material GB/T 6847 Determination of surface of film roll 0B9045 Determination of resolution of photosensitive material
GB/T9860 Determination of water absorption of photosensitive material GB/T9861 Determination of scratch resistance of photosensitive film during processing GB11500 Geometric conditions for photographic transmission density measurement GBI1501 Spectral conditions for photographic density measurement GB/T15061 General rules for photosensitivity measurement of silver halide photosensitive materials - Light conditions
3 Technical requirements
3.1 Photographic properties and physical properties
Shall comply with the provisions of Table 1,
Average slope G
Sensitivity 5
Fog density D.
Strong density D..
Resolution RP.c/mm
Emulsion layer melting point,
Absorption rate, %
Scratch resistance in washing,
Degree of curl
Approved by the Ministry of Chemical Industry of the People's Republic of China on September 6, 1993 Part 1 Exposure table for samples suitable for incandescent tungsten light and simulated sunlight
2. 4± 0. 4
2.2± 0. 4
40±12
Implemented on July 1, 1994
3. 2 Film size
HG / T 2536 93
The film size used for metric size equipment shall comply with the provisions of Table 2, and the film size used for imperial size equipment shall comply with the provisions of Table 3,
13×18
15×30
18 × 24
20 × 40
24×24
24×30
30×40
40×40
35. 6 × 43. 2
35. 6×35. 6
30. 5× 38. 1
27.9× 35. 6
25, 4× 30. 5
20. 3 × 25. 4
3.3 Edge verticality and straightness
Qualified,
3.4 rounded corners
14×17
14 × 14
12×15
11× 14
10×12
128×178
148×298||t t||178 × 238 | | tt | ×379
277×354
252×303
201×232
The four corners of the film should be rounded. The actual cutting edge of the rounded corner should be in the shaded area shown in Figure 1. The rounded corner should be free of steps or burrs. 3.3 Other properties
3.5.1 Apparent quality of raw film
HG/T 2536 -
Allowable range of rounded corners
Figure 1 Range of rounded corners
The film should be clean and non-sticky, and the edge of the film should be smooth and free of burrs. The emulsion layer shall not have any defects such as delamination, drawing, streaking, bubbles, sand holes and mechanical scratches. When stored under specified conditions, the anti-halation layer shall not discolor. 3.5.2 Quality of transparent film
The film is not exposed to light, but is directly developed, fixed and washed to make transparent film. During the processing, the emulsion layer shall not bubble or fall off. The anti-halation layer shall be completely removed. There shall be no spots, static gray fog and other defects on the transparent film. 3.5.3 Quality of gray film
The film is evenly exposed, washed under normal conditions, and processed to make gray film. There shall be no defects such as streaks, drawing, scars and other defects on the gray film. 4 Test methods
4.1 Determination of general photographic properties
4.1.1 Test conditions
HG/T 2536— 93
Unless otherwise specified, all tests shall be conducted at a temperature of 23±2℃ and a relative solids content of 45% to 55%. 4.1.2 Sampling
The samples shall be sampled after reaching equilibrium under the conditions of 4.1, 1. Take any piece of film from the unopened package and cut it into a 35mm wide piece as the test piece.
4.1.3 Reflection
The sample exposure shall comply with the provisions of GB/T15061, the color temperature of the flash light source is 5500K, and the exposure time is 1/20s.4. 1.4 Sample processing
The exposed test film should be processed within 2 hours using the set of chemicals and processes recommended by the film manufacturer.4.1.5 Density measurement and characteristic curve drawing
The density should be the national standard visual diffuse density. The geometric conditions for density measurement should comply with the provisions of GB11500 and the spectral conditions for density measurement should comply with the provisions of GB11501. The density of the processed test film is measured, and the characteristic curve is drawn with the density value as the ordinate and the exposure disk logarithm value as the abscissa: as shown in Figure 2:
IeH, gH, IgH
Figure 2 Schematic diagram of characteristic curve
4.1.6 Calculation of general photographic performance index values
4.1. 6.1 Average slope
is expressed as the slope of the N, N, line on the characteristic curve. The density at point N, is equal to the minimum density plus 0.25, and the density at point N, is the minimum density plus 2.0. The minimum density is the optical density value produced after the unblinked test piece is developed and fixed. The average slope is calculated according to formula (1): G
Where: D, N, corresponding to the density value;
D,——the density value corresponding to point Ni:
IH,-IgH
, N, corresponding to the exposure picture, ADC seconds;
H, N, corresponding to the dry light amount, dynamic ADC seconds
4. 1.6.2 Sensitivitywww.bzxz.net
It is expressed as the reciprocal of the light intensity corresponding to point M on the characteristic curve. The density of point M is equal to the minimum density plus 1.0. The sensitivity is calculated according to formula (2):
Where: S--sensitivity;
HG/T 2536-93
H—The amount of sunlight corresponding to the reference point M on the characteristic curve for calculating the sensitivity, lux seconds, 4.1.6.3 Fog density
The optical density value of the undeveloped test piece after the development and fixation process is subtracted from the optical density value of the undeveloped and only fixed test piece, 4.1.6.4 Maximum density
The density value corresponding to the highest point on the characteristic curve is taken. 4.2 Resolution determination
According to the provisions of GB 9045,
4.3 Melting point determination
According to the provisions of GB/T6843.
4.4 Water absorption determination
According to the provisions of GB/T9860
4.5 Determination of scratch resistance during washing
According to the provisions of GB/T9861.
4.6 Determination of curl
According to the provisions of GB/T6847,
4.7 Determination of film size
Use a length measuring gauge with an accuracy of not less than 0.1mm to measure, 4.8 Determination of film edge verticality and straightness
Verticality and straightness are checked by comparing the film with two independently placed rectangles. One rectangle is made according to the minimum size of the specification specified in this standard, and the other is made according to the maximum size of the specification. It is required that any point of the film edge shall not be included in the small rectangle, nor shall it exceed the large rectangle.
4.9 Determination of its properties
4.9.1 Raw film inspection
Take a piece of film from the sample to be inspected and visually inspect it under white light. Its quality should meet the requirements of 3.5.1. 4.9.2 Transparent film inspection
Take a piece of film from the sample to be inspected and inspect it visually under white light. Its quality should meet the requirements of 3.5.1.4.9.3 Gray Film Inspection
Take any piece of film from the sample to be inspected, expose it to the sun, and develop it according to the method specified in 4.1.4 of this standard. The development density should be controlled between 0.9 and 1.1. Visually inspect the gray film. Its quality should meet the requirements of 3.5.3. 5 Inspection Rules
5.1 Factory Inspection
This product should be inspected by the quality inspection department of the manufacturer according to the inspection batch record and inspection rate specified in Table 4. It can only be shipped after passing the inspection items
General photometric properties
Resolution
Balance properties
Dimensions, verticality, rounded corners
Other properties
5.2 Type inspection
HG/T2536—93
Inspection batches
Each coating agent number is a batch
Each emulsion formula number is a batch
Each coating emulsion number is a batch
Each shift output is a batch
Each coating emulsion number is a batch
Inspection ratio
Measure once every axis
Measure once for each batch
Measure once for each batch
Measure once for each cutting equipment
Measure once for each axis
When this product has any of the following conditions, type inspection should be carried out, and the type inspection should include all items specified in this standard. E. When there are major changes in product structure, raw materials, and processes: b. When the product is resumed after a long period of suspension; periodic inspections should be carried out for long-term normal production c.
. When the factory inspection results are significantly different from the previous type inspection results; e.
When the national quality supervision agency proposes type inspection requirements, 5.3 Acceptance Inspection
The receiving unit generally accepts the product based on the certificate of conformity.
If the receiving unit conducts inspection, the acceptance batch is calculated based on the factory emulsion number. At least one box of each batch of film is taken from any outer box for inspection
The inspection is carried out according to the items and methods specified in this standard. If any item index fails to meet the requirements, double the number of samples shall be taken and the unqualified items shall be re-inspected. If the re-inspection is qualified, the batch of film shall be accepted; if the re-inspection is still unqualified, the batch of products does not meet this standard. 5. 4 Quality Assurance
Films that have been accepted by the user department shall be replaced or returned within the warranty period if they have manufacturing quality problems under the transportation, storage and use conditions specified in this standard after identification. 6 Packaging and Marking
6.1 Packaging
Film packaging must ensure that the product is light-proof and moisture-proof, and ensure safe transportation and storage of the product. 6.2 Marking
6.21 In order to identify the emulsion side of the film, a notch is processed on one short side of the film and close to the rounded corner. When the operator holds the long side of the film upright and the notch is at the upper right corner or lower left corner of the short side, the side facing the operator is the emulsion side. 6.2.2 The outside of the film packaging box should be marked with: manufacturer's name, trademark, product name, product model, specifications, quantity, production batch number, implementation standard number, warranty period and "unsealed in darkroom", etc. 6.2.3 The outside of the film packaging box should be marked with: manufacturer's name, trademark, product name, model, specifications, number of reels, weight, volume, production batch number, warranty period and words or signs such as "handle with care", "moisture and sun protection", "radiation protection" and storage direction. 7 Transportation and storage
7.1 Transportation
During transportation, films should be protected from rain, sun exposure, impact, strong squeezing and movement. They should be handled with care during loading and unloading. 6
HG /T 2536 — 93
7. 2 Storage
The film should be kept in its original packaging, stored in a dry and ventilated place with a temperature below 21°C and a relative humidity below 60%, away from heat sources and at least 15cm from the ground and walls, and should be protected from the influence of harmful gases and radioactive substances. 7.3 Warranty period
The product shall be guaranteed for 18 months from the date of packaging, if transported and stored under the provisions of this standard. Note: This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of the National Photosensitive Material Standardization Technical Committee. This standard was jointly produced by the First Branch of Shanghai Photosensitive Film General Production, the First Film Factory of China Lucky Film Company, Tianjin Photosensitive Material Company and the International Film Association. The main drafters of this standard are Yu Zhongliang, Wang Chefen, Zhu Gencheng, Wu Xiankai, Shi Benhui, Zhao Jinyi, Xie Xingfang, Jian Hongmin and Gou Xipei. The People's Republic of China and
Chemical Industry Standard
Medical Computed Tomography Film
HG/T2536-93
Editor: Chemical Industry Standard Editorial Department
(Institute of Standardization, Ministry of Chemical Industry)
Postal Code: 100013
Printer: Institute of Standardization, Ministry of Chemical Industry
Copyright: Exclusive Reproduction
Format: 880×12301/16Number of Words on a Sheet: 14000First Edition in May 1994
First Printing in June 1994
Number of Prints: 1-500
Cost: 3.30 Yuan
HG/T 2536-932 Storage
The film should keep its original packaging, and be stored in a dry and ventilated place with a temperature below 21°C and a relative humidity below 60%, away from heat sources and at least 15cm from the ground and walls, and should be protected from the influence of harmful gases and radioactive substances. 7.3 Warranty period
The product has a warranty period of 18 months from the date of packaging, provided it is transported and stored under the conditions specified in this standard. Additional notes:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of the National Photosensitive Materials Standardization Technical Committee. This standard was jointly developed by the First Branch of Shanghai Photosensitive Film General Production, the First Film Factory of China Lucky Film Company, Tianjin Photosensitive Materials Company and the Guangye Group of Shanghai Film Co., Ltd.
The main drafters of this standard are Yu Zhongliang, Wang Chefen, Zhu Gencheng, Wu Xiankai, Shi Benhui, Zhao Jinyi, Xie Xingfang, Jian Hongmin and Gou Xipei,
The People's Republic of China and
Chemical Industry Standard
Medical Computed Tomography Film
HG/T2536-93
Editor: Chemical Industry Standard Editorial Department
(Institute of Standardization, Ministry of Chemical Industry)
Postal Code: 100013
Printer: Institute of Standardization, Ministry of Chemical Industry
Copyright: Exclusive Reproduction
Format: 880×12301/16Number of Words on a Sheet: 14000First Edition in May 1994
First Printing in June 1994
Number of Prints: 1-500
Cost: 3.30 Yuan
HG/T 2536-932 Storage
The film should keep its original packaging, and be stored in a dry and ventilated place with a temperature below 21°C and a relative humidity below 60%, away from heat sources and at least 15cm from the ground and walls, and should be protected from the influence of harmful gases and radioactive substances. 7.3 Warranty period
The product has a warranty period of 18 months from the date of packaging, provided it is transported and stored under the conditions specified in this standard. Additional notes:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of the National Photosensitive Materials Standardization Technical Committee. This standard was jointly developed by the First Branch of Shanghai Photosensitive Film General Production, the First Film Factory of China Lucky Film Company, Tianjin Photosensitive Materials Company and the Guangye Group of Shanghai Film Co., Ltd.
The main drafters of this standard are Yu Zhongliang, Wang Chefen, Zhu Gencheng, Wu Xiankai, Shi Benhui, Zhao Jinyi, Xie Xingfang, Jian Hongmin and Gou Xipei,
The People's Republic of China and
Chemical Industry Standard
Medical Computed Tomography Film
HG/T2536-93
Editor: Chemical Industry Standard Editorial Department
(Institute of Standardization, Ministry of Chemical Industry)
Postal Code: 100013
Printer: Institute of Standardization, Ministry of Chemical Industry
Copyright: Exclusive Reproduction
Format: 880×12301/16Number of Words on a Sheet: 14000First Edition in May 1994
First Printing in June 1994
Number of Prints: 1-500
Cost: 3.30 Yuan
HG/T 2536-93
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