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DEVELOPMENT OF A NEW SECONDARY STANDARD FOR H*(10).

K Bairlein1, B Behnke1,2, O Hupe1

  • 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany.

Radiation Protection Dosimetry
|February 25, 2020
PubMed
Summary
This summary is machine-generated.

A new prototype secondary standard for ambient dose equivalent (H*(10)) was developed. This device accurately measures radiation dose in unknown fields, fulfilling a critical need for radiation protection and calibration.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry

Background:

  • A secondary standard for ambient dose equivalent (H*(10)) is essential for disseminating the Sievert (Sv) unit.
  • Currently, no commercial secondary standard for H*(10) is available.
  • Measuring H*(10) directly is crucial for unknown radiation fields, rather than relying solely on calculations from air kerma.

Purpose of the Study:

  • To develop and validate a prototype secondary standard for ambient dose equivalent (H*(10)).
  • To address the lack of commercially available standards for H*(10) dissemination.
  • To provide a reliable measurement tool for H*(10) in diverse radiation environments.

Main Methods:

  • A prototype secondary standard for H*(10) was created using a 1-liter spherical ionization chamber.
  • Modifications included adding copper wires to the inner surface to adjust the chamber's response.
  • A Makrolon shell and aluminum coating were incorporated to optimize performance at energies below 50 keV.

Main Results:

  • The prototype ionization chamber met the requirements specified in ISO 4037-2.
  • Accurate performance was demonstrated across an energy range of 12 keV to 7 MeV.
  • The system, when paired with an electrometer, proved suitable for pulsed fields and low-energy radiation.

Conclusions:

  • The developed prototype serves as a viable secondary standard for ambient dose equivalent (H*(10)).
  • It offers a reliable method for measuring H*(10), particularly in challenging radiation fields.
  • The device is suitable for use as an area dosemeter, enhancing radiation safety protocols.