ENVIRONMENTAL DOSIMETRY WITH THE BeOSL PERSONAL DOSEMETER.

Area of Science:

• Medical Physics
• Radiation Dosimetry

Background:

• The BeOSL dosimetry system was utilized to design a dosemeter for measuring ambient dose equivalent H*(10).
• Initial energy response calculations revealed under-response within the 60-100 keV photon energy range, failing to meet IEC 62387 standards.

Purpose of the Study:

• To design and validate a BeOSL-based dosemeter for accurate ambient dose equivalent (H*(10)) measurement.
• To address and correct the under-response of the dosemeter at specific photon energies and angles of incidence.

Main Methods:

• A two-element BeOSL personal dosemeter was designed.
• Energy response calculations were performed to assess compliance with IEC 62387.
• Corrections for under-response were implemented using a linear algorithm and an additional dosemeter cover, including lead shielding for the Hp(0.07) element.

Main Results:

• The designed dosemeter initially showed insufficient energy response for H*(10) between 60-100 keV, not meeting IEC 62387 requirements.
• The implemented corrections, including lead shielding and a linear algorithm, successfully improved the energy response.
• The modified dosemeter fulfills German national requirements for H*(10) area dosimetry.
• IEC 62387 requirements were met for radiation incidence angles from 0° to 60° (rotational), and for angles from 75° to 90° under specific rotational conditions.

Conclusions:

• A modified BeOSL two-element dosemeter with a linear algorithm and lead shielding can accurately measure ambient dose equivalent H*(10).
• The system meets German national requirements and partially meets IEC 62387 standards for various radiation incidence angles.