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Related Experiment Video

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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

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Development of a neutron personal dose equivalent detector.

N Tsujimura¹, T Yoshida, C Takada

¹Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, 4-33, Tokai-mura, Ibaraki-ken 319-1194, Japan. tsujimura.norio@jaea.go.jp

Radiation Protection Dosimetry

|June 5, 2007

Summary

A novel neutron personal dose equivalent (Hp(10)) meter was developed using MCNP calculations. This instrument, featuring a moderator and a borated polyethylene shield, accurately measures neutron dose equivalents in workplaces.

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Area of Science:

Radiation detection and measurement
Nuclear instrumentation
Dosimetry

Background:

Accurate measurement of neutron personal dose equivalent (Hp(10)) is crucial for workplace radiation safety.
Existing instruments may have limitations in energy and angular response.
Development of improved neutron measurement tools is an ongoing need.

Purpose of the Study:

To develop a new instrument for measuring neutron personal dose equivalent, Hp(10).
To design an instrument with response characteristics matching Hp(10) energy and angular dependencies.
To provide a reliable tool for assessing reference neutron dose values in occupational settings.

Main Methods:

Instrument design based on Monte Carlo N-Particle (MCNP) calculations.
Utilized a conventional moderator-based neutron dose equivalent meter.
Incorporated a backward-hemisphere neutron shield made of borated polyethylene.

Main Results:

Developed a two-part neutron measurement instrument.
MCNP calculations guided the design for optimal energy and angular response.
The instrument is designed to match the energy and angular dependencies of Hp(10).

Conclusions:

The new instrument is effective for measuring neutron personal dose equivalent, Hp(10).
It will aid in assessing reference values during field testing of personal neutron dosemeters.
This tool will improve the interpretation of neutron dose readings in workplaces.