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Preliminary Dose Assessment for Emergency Response Exercise Using Unsealed Radioactive Contamination.

Lainy D Cochran¹, Craig M Marianno²

¹1Department of Nuclear Engineering, Texas A&M University, 3133 TAMU, College Station, TX.

|October 9, 2019

Summary

This summary is machine-generated.

This study assessed radiation doses for emergency response exercises using unsealed radioactive sources. Technetium-99m is recommended for radiological safety, balancing detectable dose rates with administrative limits.

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Area of Science:

Radiological Sciences
Nuclear Safety
Emergency Preparedness

Background:

Emergency response exercises are crucial for preparedness.
Accurate dose assessment is vital for safety during such exercises.
Unsealed radioactive sources present unique challenges for dose estimation.

Purpose of the Study:

To perform a preliminary dose assessment for an emergency response exercise.
To determine safe activity levels for unsealed radioactive sources.
To identify suitable radionuclides for exercise scenarios.

Main Methods:

Utilized conservative calculation methods for dose assessment.
Employed MicroShield computer code for external exposure calculations.
Estimated internal exposure using fractional intakes and dose coefficients.

Main Results:

A radionuclide-dependent activity range of 37 MBq to 1.5 GBq was established.
Detectable dose rates can be achieved without exceeding administrative limits.
Technetium-99m (Tc) resulted in the lowest dose among evaluated radionuclides.

Conclusions:

Tc is recommended for radiological safety in exercises.
The final choice of radionuclide and activity depends on budget and logistical factors.
Conservative dose assessment ensures safety during radioactive source exercises.