[en] This paper describes a development of a power supply circuit to deflect and move the electron beam across the window of the Baby electron beam machine. It comprises a discussion of circuit design, its assembly and the test results. A variety of input and output conditions have been tested and it was found that the design is capable to supply 1.0 A with 50Hz on X-axis coil and 0.4A with 500Hz on Y-axis coil. (Author)

[en] The advantage of applying liquid penetrant inspection (LPI) on almost all materials is well known. It is relatively non-costly method for detection and interrogation of open-to-surface discontinuities on non-porous surface. The most critical part in the inspection is the surface preparation. The surface shall be free of oil, grease, water, or other contaminants that may prevent penetrant from entering discontinuities. After years of applying penetrant on the surface of samples used for training purposes and post cleaning was not done properly, most of the discontinuities that were initially found in the samples were no more detected by LPI. These discontinuities were fully covered with residual of penetrant that failed to be eliminated by appropriate method of post cleaning. The paper describes ways to reveal the initial discontinuities in the sample by methods of neutron radiography and conventional radiography. (author)

[en] Radiography testing is one of the non-destructive testing methods where it is used to detect discontinuities in a material by using x-ray and gamma ray as a sources of radiation. Mobile digital radioscopy system (MDRS) is act as a detector or medium to capture and convert the image in a real time and the image produced can view directly from the computer connected to the MDRS. Calibration is one of the factors that we need to consider in order to get the image and see in a high resolution and good contrast. The advantage of calibration in MDRS is to reduce and avoid from the noise. Calibration is not stable and the imaging system must be calibrated periodically. It is also as an alternative to the radiographic film to reduce and saving cost and time with considerable saving in running cost and processing time. (author)

[en] Radiographic exposure can be determined by either trial exposure, reference to previous data or using exposure chart. Without previous data, exposure chart is the easiest and economic way to achieve correct exposure. It will minimize re-shoot and time. This paper presents the development of gamma exposure chart for Selenium-75 source. Film radiography method has been chosen for this development using steel step wedge blocks. Agfa Structurix D7 films have been used during the exposure and the optical density of the films was measured by using X-Rite densitometer. Method of development of the chart is explained. The chart is tested on pipe and welded plate test sample and the results are discussed. (author)

[en] Non-destructive Testing has been widely used in oil and gas industries, aircraft, and especially the nuclear reactor in the period leading to the nuclear power plant. It also allows parts and materials to be inspected and measured without damaging them. These tests are very important in determining and identifying the discontinuity and defects found on a materials and parts of an object. Techniques used in this test are the radiographic and liquid penetrating testing to inspect the reactor parts in reactor cooling system to avoid the reactor to fail in operation. By using radiographic testing, x-ray source have been used in the tests conducted to determine the flaws of the internal of an object. While the test of liquid penetrating testing used dye penetrant to identify defects on the surface. These tests will reduce the harm that might occur in the future to the objects or materials. (author)

[en] Computed Radiography (CR) system is an imaging system widely used in industry and medical applications. Most of the CR systems available in the market have different characteristics as they have different responses to radiation energy. Physical properties of the CR system can be measured using a phantom, and parameters such as basic spatial resolution (SRb), contrast, signal-noise ratio and equivalent penetrameter sensitivity (EPS) can be determined. This physical characterization can be used to verify the level of performance and help the user choose the best system for a particular application. This study evaluated HD-CR 35 NDT CR using duplex wire, copper step wedge, relative image quality indicator (EPS) and dosimeter. These phantoms determine the capability of the CR system to resolve the smallest geometric detail, measure the response of the CR system at different beam energies and qualities, and achievable grey value at the high dose. (author)

[en] Chiller condensers and its piping systems are major components in a HVAC system. Failure of these components would cause the systems to be inoperable. This will affect creature comfort and indirectly cause reduction in productivity. Repair would be costly due to time constraint and integrity of other components could also be compromised. In this paper, it is demonstrated how inspection of the chiller condenser and piping system is performed using advanced Non-destructuive testing (NDT) methods to determine its integrity The methods are Phased Array Ultrasonic Testing (PAUT) and Radiographic Testing - Digital (RT-D). This data is then used by the HVAC owner to plan for preventive maintenance. PAU) is used to obtain thickness mapping of the chiller condenser by employing C-Scan technique. This is achieved by using an Olympus MX2 with a 128 element phased array probe attached to a HSMT-Flex scanner. The result provided the thickness plan view of the chiller condenser. The thickness is compared by measuring with an ultrasonic thickness gauge. RT-) is used to obtain radiographic image of the pipe thickness profile using digital detector arrays for measurement of wall thickness Then the thickness is compared to the measurement using ultrasonic thickness gauge.. In this case, both of the techniques are selected due to their capabilities and limitations which have to be suited to the component under test. This paper discusses the techniques and results of the inspection. It is found that PAUT provides thickness mapping of the condenser. Material thickness measurement using ultrasonic testing and RT-D provides the real-time thicknessof the pipes. (author)

No abstract available

[en] Non-destructive testing (NDT) techniques are used in industry to evaluate the properties of a material, component or structure without causing any permanent damage. Among the techniques, pulsed eddy current (PEC) NDT is regarded as a new technique where a broadband pulse excitation is used, as opposed to single frequencies employed in conventional eddy current NDT. In this study, a 2D axisymmetric electromagnetic model of a PEC probe has been developed and it has been used to study the effects of the excitation coil diameter on the performance of PEC probes in sample thickness measurement. A PEC system has also been built to validate the model. Aluminium plates are used as the sample and they can be stacked up to replicate thickness from 1 mm to 10 mm. The results show that there is a very good correlation between the simulation and experimental results, with an average error of less than 10%. The results also suggest that the larger the diameter of the excitation coil, the deeper the penetration and therefore the larger the thickness measurement range. It has also been shown that although the larger diameters have deeper penetration, the smallest diameter has the highest sensitivity if normalization is not used. These conclusions indicate that coil diameter is an important parameter in a PEC probe design for thickness measurement applications. (paper)

[en] Ultrasonic testing is a proven reliable method which is able to detect and measure the size of defects in butt welds with acceptable tolerance. Recent advancement of technology has introduced a computerized technique which is phased array. Phased array employs focal law that enable focusing and steering of beam at the active aperture axis. This enables one line scanning but covering the whole weld volume as compared to conventional technique which employs aster scan and multiple probes to completely cover the whole weld volume. Phased array also gives multiple data view which assist the interpreter. This paper is about the study of these two techniques and technical analysis of comparison between the two. The conventional technique is performed using GE USM GO with 4 MHz 45 degrees shear wave probe. The phased array technique uses OLYMPUS OMNISCAN MX2 with 5L64 linear array probe with 16 elements aperture and 55 degrees wedge emitting shear wave into the specimen. Sensitivity of both techniques are based on 1.5 mm Side Drilled Hole. The results are compared and analysis such as defect sizing and defect type determination are performed. (author)