0.2777 amperes per watt. Spectral Responsivity Fig. The two curves are for different entrance window materials. In many applications it is dose or dose rate , rather than absorbed energy that is the quantity of interest. Dose is defined as Energy absorbed per unit mass .
Dose rate is defined as energy absorbed per unit mass per unit time .
The standard SI unit for dose is the joule per kilogram, which has been named the gray . In many applications a measurement of the intensity of an external radiation field, rather than an explicit measure of absorbed dose or dose-rate in the diode, is required. In radiation protection applications, the intensity of the external radiation field is termed exposure dose-rate and is commonly expressed in units of roentgens per hour . The curves shown in Fig. 3 below are for the Si wafer only, and do not take into account any effects due to the window, substrate, or package in which the diode is mounted.