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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Radiation protection calculations for an Am-Be neutron source
Y Fried1, A Ben-Shlomo1, O Aviv1
1Radiation Safety Department, Soreq Nuclear Research Center, Yavne, Israel;
Calculating dose rates from Americium-Beryllium (Am-Be) sources requires considering both neutron and photon emissions. Photons from Am-241 decay and nuclear reactions significantly contribute to the total dose rate, comparable to neutron contributions.
Area of Science:
- Nuclear Physics
- Radiation Detection and Measurement
- Medical Physics
Background:
- Am-Be sources are common neutron emitters, but photon contributions to dose rates are often underestimated.
- Existing gamma-ray dose constants for Am-241 are inconsistent and vary widely in literature.
- Accurate dose rate calculations are crucial for radiation safety and experimental design.
Purpose of the Study:
- To accurately calculate dose rates around an Am-Be source, considering both neutron and photon emissions.
- To investigate the significance of photon contributions to the total dose rate from Am-Be sources.
- To validate dose calculations using the FLUKA Monte Carlo code against analytical methods and experimental measurements.
Main Methods:
- Utilized FLUKA, a multipurpose Monte Carlo code, for detailed particle transport and interaction simulations.
- Performed dose rate calculations for a 1.85-GBq Am-Be source.
- Compared simulation results with analytical calculations and data from radiation measurements.
Main Results:
- Photon emission from 241Am decay (59.5 keV) and 12C* de-excitation (4.4 MeV) are significant dose contributors.
- The calculated photon dose rate contribution was found to be of the same order of magnitude as the neutron dose rate.
- FLUKA simulations provided reproducible and reliable dose rate estimations.
Conclusions:
- Photon emissions must be considered alongside neutron emissions for accurate dose rate assessments of Am-Be sources.
- The FLUKA Monte Carlo code is a suitable tool for precise dose rate calculations in complex radiation fields.
- This study highlights the need for updated and reliable dose rate constants for Am-Be sources.
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