In both models, a bipolar X-ray tube power supply circuit operating at a frequency above 100 kHz and a compact X-ray tube 0.1BPM27-250 are used.
In both models, a bipolar X-ray tube power supply circuit operating at a frequency above 100 kHz and a compact X-ray tube 0.1BPM27-250 are used. The device MART-250 uses a 0.1BPM tube with a side exit of x-ray radiation in a solid angle of about 50%, and in the device MART-200 it uses an end radiation output in an angle of 140 °. Characteristics of the devices of the MART series are given in Table 2
If the principle of operation of the pulse devices and devices of constant potential are completely different, then according to their characteristics they are quite close, although each series has its own advantages and disadvantages.
Pulse devices are distinguished by their simplicity of design, convenience in the control of welded joints in the field, and most importantly - low cost. At the same time, the devices of the MART series provide better quality of X-ray images, have a sharper focus, and a longer X-ray tube life.
The choice of one or another type of apparatus is dictated by specific requirements for the quality of control in terms of the customer and his financial capabilities.
Indicative nomograms for MART devices
On the link above, you can find a tool for an approximate estimate of the exposure time for MART devices using different films and focal lengths for different materials. Select in the right column the focal length, film type, translucent material and model of the device and press the "Calculate" button.
Remember that X-ray films and, especially, screens have a variation in sensitivity, and the apparatus - the inevitable technological variation of parameters, therefore, the time calculated from nomograms is not exact, but serves only for preliminary evaluation. For calculations, we used the average passport values of the sensitivity of films and screens, and the linear attenuation coefficients of x-rays in materials. In your particular case, the combination of parameters may be different and the time may differ slightly from that calculated by nomograms.
