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CORRECTIONS ASSOCIATED WITH ON-PHANTOM CALIBRATIONS OF NEUTRON PERSONAL DOSEMETERS
N P Hawkes1, D J Thomas2, G C Taylor2
1National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK nigel.hawkes@npl.co.uk.
Radiation Protection Dosimetry
|October 2, 2015
Summary
Neutron personal dosemeters response varies with energy and angle. This study quantifies corrections for dosemeters mounted on phantoms near neutron sources, accounting for varying incidence angles and energies.
Area of Science:
- Radiation Detection and Measurement
- Neutron Dosimetry
- Applied Physics
Background:
- Personal dosemeters are crucial for radiation safety.
- Accurate neutron dosimetry requires understanding dosemeter response to energy and incidence angle.
- Standard calibration methods may not fully capture real-world exposure conditions.
Purpose of the Study:
- To investigate and quantify the angular and energy dependence of neutron personal dosemeter response.
- To develop correction factors for dosemeters exposed under non-ideal conditions.
- To improve the accuracy of neutron dose equivalent measurements.
Main Methods:
- Mounting multiple neutron personal dosemeters on a slab phantom.
- Exposing the phantom-dosemeter system to neutrons from accelerator-based and radionuclide sources at close proximity (75 cm).
- Varying the angle of incidence and considering the spatial variation of neutron energy and fluence.
Main Results:
- Significant variations in dose equivalent were observed across dosemeters due to changing incidence angles and source distance.
- Neutron energy and fluence variations, especially with accelerator-produced neutrons, further impact dose equivalent.
- Correction factors were derived to account for these observed effects.
Conclusions:
- The response of neutron personal dosemeters is significantly influenced by the angle of incidence and neutron energy.
- Standard calibration setups may lead to inaccuracies if these effects are not considered.
- Quantified corrections are necessary for accurate neutron dose assessment in practical scenarios.
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