First choose a material. Each material has a mass attenuation consatant, Mu. Next, the Voltage to the x-ray source needs to be set. Continue to fill in numbers for the rest of the variables. The current is the number of milli-Amps that flow to the source. After the Distance, Time, and Thickness have been set, press the Calculate button.

Note, the Io field has a number in it. This is the initial intensity of the x-ray beam. For large numbers, you may need to use the mouse to see the entire number. Click on the number and move the mouse as if you were selecting it. The cyan pointer indicates the density on the resultant radiograph. The two other pointers represent under- and over-exposure by a factor of four. These may be used to judge the degree of contrast in the resultant radiograph.

Caution: This applet should be used for educational purposes ONLY and is NOT valid for scientific, medical or industrial purposes.