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![]() ![]() The BJT is built with semiconductor material and the most common today is still silicon crystal doped with some types of impurities. At that time, the success of this innovation was absolute, since the researchers of the “transistor effect” had won a Nobel Prize in 1956 and the transistor became a milestone that changed our lives. The first commercial transistors were manufactured in large scale in the 1960s, when the first radios and TVs made with these solid state devices appeared in stores to replace electronic equipment with electronic valves. The bipolar transistors are also part of several types of industrial controllers, electronic systems for vehicles, airplanes, ships, linear accelerators, scientific equipment, test and measurement instruments, among others. The BJT is an electronic device that is part of the most varied types of electronic equipment both in discrete form and the well-known integrated circuit (IC) form. A Brief Background on Bipolar Junction Transistor In the analysis of BJT under an X-ray beam, in addition to its operation as a sensor to measure the dose or some diagnostic X-ray tube parameter, it has also led to technological innovation in the technique of digital data storage based on the effect of radiation.ġ.1. In electronics, the BJT is used as a current amplifier, and depending on the bias and point of view it also becomes a voltage amplifier. Even knowing that the most complete theory to describe the “transistor effect” is based on quantum theory (the energy band theory of solids), here it is preferable to take a simpler experimental approach to clearly understand the operation of the BJT. Therefore, it addresses some topics such as the structure of the device, the bias configuration when operating in active mode, and so on. In this article an overview on the BJT and its principle of operation were made for the purpose of better understanding how such a semiconductor device behaves when under diagnostic X-ray beam. Although not manufactured to be used under X-ray photons, the commercial bipolar junction transistor (BJT) is an electronic device that can be used as an ionizing radiation sensor. ![]()
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