In this laboratory we will see some to those characteristics of silicon detectors which make them very useful in the fields of Medical Physics. One of the application of these devices that we will work with is in detecting low energy X‐ray radiation (from 6 to 30KeV). In this laboratory we will learn something of the aquisition system (LabVIEW), the readout system (PCI‐1200 card, buffer, RX64 chip and the silicon detector on the printed circuit board) and the measurements of the X rays (coming from a radiation source) for different positions of the detector, in searching for improving the efficiency of detection. © 2003 American Institute of Physics