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Published on: May 7, 2021
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
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.
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.
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