Welcome to NDT Inspect's industrial radiography (RT) group, a place for professionals to connect and discuss the latest techniques and technologies in industrial radiography.
RT is a non-destructive testing method that uses ionizing radiation to inspect the condition of components such as pipelines, tanks, and pressure vessels. The radiation is directed through the component and is absorbed differently by different materials, allowing for the detection of flaws, defects, or other abnormalities within the component. Our member group offers a platform for sharing knowledge and best practices on RT and its applications in various industries. Join our community of experts from around the world and be a part of the conversation on advancing the practice of industrial radiography.
Updates
-
srinivas-bommakanti replied to a discussion7 months agooption 3
-
ndtcs replied to a discussion1 year agoTo calculate sensitivity for a DWDI (Double Wall Double Image) technique, the job thickness you should consider is option 3:(5.54+1.5)X2
This is because in DWDI, the X-ray beam passes through two walls (each with its own thickness, including weld reinforcement), so the effective thickness for sensitivity calculation is the sum of both walls.
Refer to Section V of ASME BPVC (Article 2, Mandatory Appendix I), where guidelines for determining sensitivity and thickness for DWDI are typically discussed. Ensure to verify your calculation with the specifics of the code edition you're using.
https://ndtcs.com/ndt-technician-training
-
ndtcs replied to a discussion2 years ago
To calculate the safe working distance from a radiographic source, you’re correct that the inverse square law is the starting point, as it describes how radiation intensity decreases with the square of the distance from the source. However, there are additional factors to consider, such as the use of collimators and the specifics of the setup.
Collimator and Shielding Effects: A collimator focuses the radiation beam and reduces scatter, meaning the radiation is more directional, which can help limit exposure to areas outside the primary beam. This can allow workers to safely be closer to the source in directions that are outside the collimated beam. However, this reduction will depend on the type and quality of the collimator, so actual dose rates should be measured with a survey meter in the field.
Double-Wall Exposure and Pipe Thickness: With a double-wall exposure and a 1/2" thick pipe, the material itself provides some shielding. However, the attenuation through the pipe won’t be enough to significantly reduce the required safe distance. Again, the inverse square law applies, but you should factor in how the beam is directed based on the exposure technique and orientation of the source relative to other work areas.
Direction of Radiation: Radiation is most intense in the primary direction of the beam, but scatter can occur in all directions. The direction of the radiation (whether it’s horizontal or vertical, for example) will affect where it’s safe to stand. Be especially mindful of any areas where scatter could be more pronounced, such as corners or tight spaces.
Field Survey for Accuracy: The most practical way to determine safe working distances, given the variables of collimation, pipe thickness, and direction, is to perform a radiation survey using a calibrated dose-rate meter. This will give you real-world measurements of the radiation field around the source, taking into account the setup and any shielding effects from the collimator or materials.
For a rough estimate, apply the inverse square law to the expected dose rate at a known distance, but rely on the survey meter to determine actual safe working distances in the specific situation. Always ensure that workers in adjacent areas are adequately shielded or at a safe distance, and post warning signs or barriers to demarcate restricted zones.
https://ndtcs.com/ndt-technician-training
👍1 -
ndtcs replied to a discussion2 years ago
Radiography testing has benefits such as the fact that it is possible to inspect the inside of an object without compromising the object’s integrity. It offers extremely clear images thus facilitating the identification of some defects such as cracks, voids, and inclusions. This method is suitable for many types of material and thicknesses and is not limited to simple shapes. Also, radiography testing is safe and reliable, which makes it suitable to be applied in sensitive areas such as aerospace and construction....https://ndtcs.com/ndt-technician-training
-
ndtcs replied to a discussion2 years ago
Radiographic Non Destructive Testing is a method of examining the internal surface of a material or a component without causing any harm to it. This method uses ionizing radiation like X-rays or gamma rays to pass through the material and record an image on a radiographic film or digital detector. This way, the inspectors can recognize such internal flaws as cracks, voids, or inclusions and guarantee the performance and quality of the essential components in aerospace, manufacturing, and construction industries. Radiographic NDT is appreciated because it offers a record of the inspection and is versatile in terms of materials and thickness...https://ndtcs.com/ndt-technician-training
-
ndtcs replied to a discussion2 years ago
Radiography is a fulfilling occupation because it is a critical component of the healthcare system. Radiographers employ the use of sophisticated equipment in the diagnosis and management of diseases and hence play a very crucial role in the health sector. The demand for radiographers is constant, which means that the employment opportunities are secure and well-paid. Also, the field offers chances for a subspecialty in MRI, CT, and mammography among other services. However, it entails a good understanding of science, precision, and the capacity to operate under stress. Thus, for those who are eager to work in the sphere of healthcare and technology, radiography can be an interesting and stable occupation....https://ndtcs.com/ndt-technician-training
-
NDT-Inspect posted an update in the group Radiography3 years agoDid you know?
X-rays were discovered by the German physicist Wilhelm Röntgen in 1895. Röntgen was working on experiments with cathode ray tubes, which produce a beam of electrons, when he noticed that a fluorescent screen in his laboratory began to glow whenever the cathode ray tube was turned on. This puzzled him, as the screen was several meters away from the tube and was shielded by a lead plate. Röntgen realized that the glowing was caused by a previously unknown type of radiation, which he called X-rays because they were "unknown" at the time. He published his findings in a paper titled "On a New Kind of Rays," which quickly gained attention and led to further research on X-rays and their potential applications. Röntgen was awarded the first Nobel Prize in Physics in 1901 for his discovery of X-rays.
-
NDT-Inspect posted an update in the group Radiography3 years ago
Did you know:
X-ray films are made of a light-sensitive emulsion that is coated onto a transparent plastic or glass base. The emulsion contains a mixture of silver halide crystals, which are sensitive to X-rays, and other chemicals that are used to process the film and develop the image.
When exposed to X-rays, the silver halide crystals in the emulsion are activated and form a latent image, which can be developed and made visible using a chemical processing technique. The resulting film contains an image of the object that was X-rayed, showing the internal structure of the object in varying shades of black and white.
-
NDT-Inspect posted an update in the group Radiography3 years ago
Industrial radiography is a type of nondestructive testing (NDT) method that uses ionizing radiation to detect and evaluate defects in materials. The test is performed by exposing the material to a beam of ionizing radiation, such as X-rays or gamma rays, and then using specialized imaging equipment, such as film or digital detectors, to create a visual representation of the material.
Any defects in the material, such as cracks or voids, will interrupt the passage of the ionizing radiation and will be visible on the radiograph. Industrial radiography is commonly used to inspect metals, ceramics, and composites for defects that could affect the strength and performance of the material.
-
NDT-Inspect created a poll in the group Radiography4 years ago
Film selection for an X-ray exposure depends on:
-
NDT-Inspect created a poll in the group Radiography4 years ago
The primary function of a darkroom is the protection of sensitive film by control of:
-
noizyboy posted an update in the group Radiography4 years ago
👍5 -
mohamed-ali-bagath joined the group Radiography4 years ago -
Holld posted an update in the group Radiography4 years agoAcceptable? 😆😆😆
👍1 -
holld posted an update in the group Radiography4 years ago
