The current web calculator for **collision** electronic stopping power is based on a fit of the tables - based on ICRU Report 37 - from EStar code at NIST.

The fitting function is a polynomial of degree 15 and the tables are reproduced with a maximum discrepancy < 1%.

The following link give access to the Web Applications for the Electronic Stopping Power and Dose for Electrons:

- Electronic Stopping Power and Ionizing Dose Calculators for Electrons

### How to use this Electronic Stopping Power and Ionizing Dose Calculator

This tool calculates the Electronic Stopping Power curve for a particle incident on a material.

The input parameters and options for the tool are described below. When the input form has been completed, pressing the "CALCULATE" button will start the calculation and open the "Results" page (allow for pop-up in your browser settings). The result page will be also linked at the bottom of the calculator page.

### Input Parameters:

- Target material (Single Element or Compound)

- Calculator energy limits.

- Particle fluence for dose calculation.

### Target Material

In the section "Target Selection" it is possible to specify a **Single Element** target material or a predefined **Compound** material.

Following is the maximum difference percentage between the fit and ICRU tables for single elements as a functions of the target atomic number (Z):

The overall max difference for compounds is 0.36% and the average difference is 0.17%.

### Energy Limits

This section define the energy limits of the calculation, and the following parameters will be defined:

- Minimum Energy of the incident particle

- Maximum Energy of the incident particle

The output table will contain 20 fixed values for each decade within the above selected range.

Moreover a text box is provided for entering additional energies. The input format is one energy per line; it is also possible to copy and paste energy values.

### Particle Fluence for Dose Calculation

Here has to be inserted the particle fluence to be used to obtain the corresponding deposited Dose.

### Result

The result page contains the input parameters, the Electronic Stopping Power curve and the result table, which includes the Ionizing Dose (in [MeV g^{-1}] and [Gy])