ASTM E393 Barium-140 Fission Dosimeter Reaction Rate Testing
The amount of the fission product 140Ba produced by the non-threshold reactions 235U, 241Am, and 239Pu, as well as the threshold reactions 238U, 237Np, and 232Th, is determined using ASTM E393. The SI units are to be taken as standard.
TRUSTED BY
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
ASTM E393 Reaction Rate Measurement Overview
ASTM E393 describes a standard test method for measuring nuclear reaction rates by analyzing barium-140 (Ba-140) produced in fission dosimeters. This method is used in nuclear science and engineering to quantify neutron flux and fission reaction rates.
The technique involves irradiating dosimeter materials, followed by radiochemical analysis of Ba-140, a fission product. Accurate measurement of Ba-140 activity enables precise determination of reaction rates in nuclear environments.
Scope, Applications, and Benefits
Scope
ASTM E393 outlines procedures for determining reaction rates using radiochemical analysis of Ba-140. It evaluates:
- Fission reaction rates
- Neutron flux characteristics
- Radioisotope activity (Ba-140)
- Nuclear material behavior under irradiation
Applications
- Nuclear reactor monitoring
- Radiation dosimetry
- Nuclear research and testing
- Fuel performance studies
- Neutron flux measurement
Benefits
- Provides accurate reaction rate determination
- High sensitivity to neutron-induced fission
- Supports reactor safety and monitoring
- Enables precise dosimetry analysis
- Useful for advanced nuclear research
ASTM E393 Reaction Rate Test Process
Dosimeter Preparation
Fission dosimeter materials are prepared and positioned for irradiation.
1Irradiation
Dosimeters are exposed to neutron radiation in a controlled environment.
2Radiochemical Analysis
Ba-140 is chemically separated and its radioactivity is measured.
3Calculation & Reporting
Reaction rates are calculated based on measured activity and reported.
4ASTM E393 Reaction Rate Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Fission dosimeters (e.g., uranium-based materials) |
| Radiation Source | Neutron irradiation (reactor or test facility) |
| Measured Outputs | Reaction rate, Ba-140 activity |
| Detection Method | Radiometric counting (gamma spectroscopy) |
| Sensitivity | High sensitivity for neutron-induced reactions |
| Test Environment | Controlled nuclear or laboratory conditions |
Instrumentation Used for Testing
- Neutron irradiation facility or reactor
- Radiochemical separation setup
- Gamma-ray spectrometer
- Radiation detectors
- Shielding and safety equipment
- Data acquisition system
Results and Deliverables
- Reaction rate values
- Ba-140 activity measurements
- Neutron flux evaluation
- Dosimetry analysis report
- Compliance reports
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Frequently Asked Questions
It measures nuclear reaction rates by analyzing the activity of barium-140 produced in fission dosimeters, providing accurate data for neutron flux evaluation and radiation dosimetry in nuclear research and reactor environments.
Barium-140 is a fission product whose radioactive activity is measured to determine the extent of fission reactions, allowing calculation of reaction rates and neutron flux in irradiated materials.
It enables precise measurement of neutron-induced reactions, supporting reactor monitoring, safety analysis, and research in nuclear science where accurate dosimetry and reaction rate data are critical.
Fissionable materials such as uranium-based dosimeters are commonly used, as they produce measurable fission products like Ba-140 when exposed to neutron radiation.
Nuclear energy, research laboratories, and radiation testing facilities use ASTM E393 to measure reaction rates, monitor neutron flux, and ensure safety and performance in nuclear systems and experiments.
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