OLTARIS

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The On- Line Tool for the Assessment of Radiation in Space, (OLTARIS, https://oltaris.nasa.gov) is a web-based set of tools and models that allow engineers and scientists to assess the effects of space radiation on spacecraft, habitats, rovers, and spacesuits. The site is intended to be a design tool for those working radiation issues for current and future missions, as well as a research tool for those developing advanced material and shielding concepts. The tools and models are built around the HZETRN transport formalism [1-3] radiation transport code and are currently focused on human-related responses. This code and the team behind its continuing development have been specified by NASA as the standard for all future manned missions. The current capabilities include:

User Selected Environment(s)

  • Free Space Galactic Cosmic Ray (GCR) at 1 AU
  • Free Space Solar Particle Event (SPE) at 1 AU
  • Earth Orbit (Circular)
  • Europa design environments (electrons and protons - 105 days at Europa, Jovian Tour, Peak flux at 5Rj and 9Rj)

User Defined Thickness Distributions (complex vehicle geometries)

  • Upload thickness distribution(s)
  • Supported Materials : Aluminum , Polyethylene (CH 2 ), and Tissue (user defined materials coming soon)

User Defined Materials for multi-material slab calculations

  • Materials can be defined by chemical formula, elemental mass percentage, or molecular mass percentage
  • Arbitrary slabs can be created using the user-defined materials

User Selected Response Function(s)

  • Differential Flux / Fluence
  • Dose in tissue or silicon
  • Dose equivalent based on ICRP60 standard
  • Whole-Body Effective Dose Equivalent CAM, CAF, MAX, and FAX
  • TLD-100 (Thermo-Luminescent Dosimeter)
  • TEPC (Tissue Equivalent Proportional Counter)
  • LET (Linear Energy Transfer) in tissue or silicon

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. To register for OLTARIS, follow this link to the OLTARIS home page. Next select the Register link at the top of the home page and and complete the Sign-up Form for OLTARIS 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.

References

  1. John E. Nealy, C.K. Chang, Ryan B. Norman, Steve R. Blattnig, Francis F. Badavi, Anne M. Adamczyk, "A deterministic computational procedure for space environment electron transport,” Nuclear Instruments and Methods in Physics Research B 268 (2010) 2415–2425
  2. Slaba, T.C., Blattnig, S.R., Aghara, S.K., Townsend, L.W., Handler, T., Gabriel, T.A., Pinsky, L.S., Reddell, B., “Coupled Neutron Transport for HZETRN”. Radiation Measurements, Volume 45 pp. 173-182 (2010).
  3. Slaba, T.C., Blattnig, S.R., Badavi, F.F., “Faster and more Accurate Transport Procedures for HZETRN”. NASA Technical Paper 2010 – 216213 (2010).