Welcome To The B N L Tandem Van de Graaff Accelerator
TVDG LET Calculator

This program calculates the Peak LET, Corresponding Energy and Range as well as the LET and Range at the Specified Energy for the Specified Ion in the Specified Target.

The Peak LET, Corresponding Energy and Range as well as the LET and Range at the Specified Energy for the Specified Ion in the Specified Target will be returned.

Select your Target from the list

Select your Ion from the list

Enter your Total Ion Energy
MeV

Atomic Mass times Energy/Nucleon

Please be patient. These calculations are complicated and require some time to complete.

Attention: LET is a program written in the 1970s that uses the Bethe Bloch formula to estimate energy losses of ions in solids. It works reasonably well for ion energies larger than ~1 MeV/amu and for ions heavier than lithium. However the program SRIM makes better estimates for all ions over much larger energy ranges. This program is easy to use and can be downloaded for free from http://www.srim.org/. If you need accurate results please use SRIM instead of LET.

Thank you for using LETCalc.

Send comments to <ccarlson@bnl.gov>


If you are running Windows 95 or later you can download a personal version of the LET Calculator Program Here. The file is about 250K in length. You will need WinZip to unzip the downloaded file.


Terms and Definitions

LET

Linear Energy Transfer is the energy absorbed by the target through which a particle is traveling per unit length of the track of the particle. For the purposes of this calculator, the LET is expressed in units of MeV/mg/cm2 (Million electron volts per milligram per square centimeter).

Range

The distance a particle of a given energy will travel through the target until it is stopped. For the purposes of this calculator, the Range is expressed in microns.

Peak LET

The maximum value the LET can assume with the specified materials (ion and target).

Energy for Peak LET

The energy at which the Peak LET occurs.

Last updated 11:05 AM 12/7/04

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