This research aimed to determine location and distribution of groundwater inBapangsari, Bagelen, Purworejo. This research usedVertical Electrical Sounding (VES) method with Schlumberger configuration. Research data were taken by using resistivity meterIPMGEO. This researchdid on2 locationswith lengthof line is 180 m.The data were processed using software Microsoft ExcelandIP2WIN. Based onresult of theresearch.On the first location, groundwaterisat 32,2 m depth with 3,3 m thick. On the first location, groundwater is at 34,6 m depth with 9,5 m thick. Groundwateronthe first locationisshallower than second location. However, onthe first locationhaveover burden. The over burden has big enough resistivity value(higher than 100 ohm m). This value has been identifying of a solid layer. The layer is andesitic breccia. Whileon second location, the over burden hassmall enough resistivity value (50 ohm m). This value has been identifying of a sedimentary layer. The layer is weathered breccia and gravel.

This paper presents the development of an object rotator to be applied in digital radiography to modify it as 3D micro-CT. The device was developed using I2C LCD display, tactile buttons and a stepper motor with an L293D motor shield. The first development stage was testing all components. The circuit was designed and then realized using the components that were tested. The device was designed to rotate discretely from rotation angle of 0 – 360° in 256 steps. For performance testing, the device was tested for a rotation angle range of 0° to 90°. The images of each rotation were captured and measured by Inkscape to determine the magnitude of the rotate angle of the object rotating device. The measurement results are compared with theoretical data to determine device error. The highest error was 4.79%. The device was then applied in digital radiography as an object rotator so that the digital radiography functioned as a micro-CT. By using a phantom as an object, the device as an object rotator in micro-CT was tested. The results showed that the device could capture and develop a 3D image of the phantom.

Calcium Sulfate Dyhidrate/gypsum is a material commonly found in nature which is used at industrial site for making a wall, roof, etc. One of the problems found in material industry is crack deffect, white crack defects is very difficult be identified it visibility. Radiography Non-Destructive Test (RNDT) is non destructive test supported by digital radiographic producing digital image. This work aims to determine the gypsum properties to find out crack defect using RNDT. Radiographic image depends on exposure factors (kV, mA, s, and SID). Digital image can be proceed using OctaveGUI to determine the crack defect area, image processing using Prewitt detection. Radiographicdigitalresultof3gypsumboards(a,bandc)and2gypsumprofilsamples (d and e) were found the crack on each samples. RNDT was perfomed using X-ray voltageat60kVona,b,c,d,andesamples.Eachsamplescrackareavalueare158.13 mm2; 127.43 mm2; 196.81 mm2; 73.97 mm2; dan 18.80 mm2. Others RNDT was using X-ray voltage at 70 kV on samples a, b, c, d, and e. Each samples crack area value are 220.62 mm2; 1,711.57 mm2; 209.33 mm2; 76.50 mm2; dan 11.18 mm2. In conlusion, the crack area values obtained can be used as RNDT.

Much development of medical devices has been made in the field of radiology. An example is the development of analog radiology into digital radiology. The result of a digital radiographic x-ray is a digital radiograph that can be processed further with image processing techniques. After that it can be printed (printed image) or sent by a teleradiology method. To increase the digital image results, a delay was needed between the opening of the camera lens and the x-ray exposure. Then a delay circuit optimization is needed between the DSLR (digital single lens reflex) cameras, and x-ray exposure on Arduino Uno-based analog radiographs which are used as a unit delay and relay. In the unit delay, a push button triggered a millisecond, so that the Arduino IDE program was needed to set a delay. The relay functioned as a separator between the DC (Direct Current) on the camera and the AC (Alternating Current) on the x-ray tube. The results obtained were that the longer the x-ray exposure, the more intensity. Variation in delay time was regulated in the Arduino IDE program to get the best image quality with the least intensity of light to reduce radiation side effects in patients.