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A NEW SEMI-EMPIRICAL AMBIENT TO EFFECTIVE DOSE CONVERSION MODEL FOR THE PREDICTIVE CODE FOR AIRCREW RADIATION

T Dumouchel1, M McCall2, F Lemay2

  • 1PCAIRE, Inc., 38 Colonnade Rd, Ottawa, ON, Canada dumouchel@i-s-r.ca.

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|December 2, 2015
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Summary

A new model improves aircrew radiation dose estimation by using tissue-equivalent proportional counter data and updated ICRP 103 recommendations, showing a ~30% dose reduction compared to older models.

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Area of Science:

  • Radiation dosimetry
  • Aviation safety
  • Cosmic radiation

Background:

  • The Predictive Code for Aircrew Radiation Exposure (PCAIRE) estimates aircrew radiation dose using ambient dose equivalent and effective dose (E/H) conversion.
  • Current E/H conversion relies on ICRP 60 radiation weighting factors and transport calculations.
  • There is a need for updated models reflecting current recommendations and measurement data.

Purpose of the Study:

  • To develop and validate a new semi-empirical effective dose to ambient dose equivalent (E/H) model for aircrew radiation exposure.
  • To incorporate updated International Commission on Radiological Protection (ICRP) 103 recommendations into the PCAIRE code.
  • To improve the accuracy and conservatism of effective dose estimations for aircrew.

Main Methods:

  • Utilized flight data measured by a tissue-equivalent proportional counter (TEPC).
  • Separated TEPC data into low- and high-lineal-energy spectra to determine E/H ratios.
  • Developed a new semi-empirical E/H model using ICRP 103 radiation weighting factors.
  • Validated the model against Monte Carlo N-Particle (MCNP) transport code simulations.

Main Results:

  • The new ICRP 103-based semi-empirical E/H model predicts approximately a 30% reduction in effective dose compared to the ICRP 60-based model.
  • Ambient dose equivalent is a more conservative dose estimate at typical jet aircraft altitudes (7-13 km).
  • The model accurately estimates effective dose, validated by MCNP simulations.

Conclusions:

  • The new semi-empirical E/H model provides a more accurate and up-to-date estimation of effective dose for aircrew.
  • Implementation of this model enhances the PCAIRE code's capability for radiation exposure assessment.
  • Updated dosimetry recommendations (ICRP 103) lead to a significant reduction in estimated aircrew radiation dose.