Welcome to OLTARIS, the On- Line Tool for the Assessment of Radiation in Space. OLTARIS is an integrated tool set utilizing HZETRN (High Charge and Energy Transport). These tools are intended to help scientists and engineers study the effects of space radiation on shielding materials, electronics, and biological systems. This site is intended for users knowledgeable about space radiation and shielding concepts. A users guide and some reference documentation can be found under the Documentation and Links page linked above.

Newest Features

• Added design reference SPE environments for electronics.
• Added the option to select Lunar and Mars surface environments for the response vs. thickness 'Simple Inputs' project types.

Registration

There are no charges associated with the use of OLTARIS, but users must register and get approval from the site administrators before accessing the site contents. New users should click the Sign up link above and complete the OLTARIS Sign Up page. After registration is complete, one of the site administrators will activate your account when approved, and confirmation will be sent to the supplied email address.

System Requirements

OLTARIS requires a standard browser with JavaScript.

Current Capabilities

This is an evolving tool set; new capabilities can and will be added. Please contact the site administrator with comments and suggestions.

User Selected Environment(s)

• Free Space Galactic Cosmic Ray (GCR)
  • Badhwar-O'Neill 2010, 2014, and 2020; Matthia 2013; SINP 2016
  • Select historical solar minimum or maximum and input duration
  • Input start and end dates
  • Input fitting parameter
• Free Space Solar Particle Event (SPE)
  • Select historical spectra
  • Input parameters for a specific fitting function
  • Select design reference events for electronics
• Earth Orbit
  • Circular orbit by start/end data, altitude, inclination
  • AP8 and AP9 trapped models
  • Upload user-defined trajectory
• Mars Surface Environment
  • Mars-GRAM or Mars Climate Database (MCD) atmosphere models
  • Albedo included via 3D transport of near-surface environment
• Lunar surface with albedo

User Defined Geometry

• Upload thickness distribution(s)
  • Interpolation-based analysis limited to three user-defined materials/layers
  • 3D analysis available for up to 5000 user-defined materials/layers
• Slabs and spheres can be defined with any number of materials/layers in any order

User Defined Materials

Materials can be defined by:
• Chemical Formula
• Elemental Mass Percentage
• Molecular Mass Percentage

User Selected Response Function(s)

• Differential Flux / Fluence
• Dose in tissue or silicon
• Dose Equivalent (ICRP60 or NASA Q)
• Whole-Body Effective Dose Equivalent CAM, CAF, MAX, and FAX (NCRP-132 or NASA tissue weights)
• Gray Equivalent
• Risk of Exposure Induced Death (REID), Risk of Exposure Induced Cancer (REIC)
• LET (Linear Energy Transfer) in tissue or silicon

Known Issues

The OLTARIS development team is always in the process of making improvements and additions to the site. If you encounter an issue you feel is a bug in the product, please let us know about it. You can use the links which are posted at the top of each page or those here: Report a Bug / Send a Comment for reporting bugs and submitting comments. The OLTARIS development team appreciates your feedback!

Here is a list of known issues:

1. Help documents and user guides may not be up to date. If it doesn't agree with what's on the page, it probably just needs to be updated. Please let us know.