ASTM E393 is a standard test method for measuring reaction rates by analysis of barium-140 from fission dosimeters. 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 this test method. Use SI units as standard.
ASTM E393 Standard Test Method for Measuring Reaction Rates by Analysis of Barium-140 From Fission Dosimeters
What is ASTM E393?
What is the Scope of ASTM E393?
ASTM E393 describes two procedures for measuring reaction rates by determining the amount of the fission product barium-140 (¹⁴⁰Ba) produced by specific non-threshold and threshold nuclear reactions
- Barium-140 properties: It has a half-life of 12.752 days and emits gamma rays of several energies.
- Detection requirement: Because gamma rays are not easily detected in the presence of other competing fission products, the standard requires chemical separation or an indirect determination of ¹⁴⁰Ba activity by counting its daughter product.
- Application: This method is used in nuclear science and reactor surveillance to monitor neutron fluence and assess material irradiation environments.
When the reaction rate of a detector nuclide with a known cross section is paired with information about the neutron spectrum, the magnitude of the fluence rate impinging on the detector may be calculated. Fission produces 140Ba, which is a radioactive nuclide. The relative yield will vary even though it is generated in the fission of any heavy atom. 140Ba has a half-life of 12.752 days. The half-life of its daughter, 140La, is 1.6781 days. Because of the extended half-life of 140Ba, counting can be postponed for several weeks following irradiation in a high-neutron environment. Because the decay constant and yield of 140Ba are more precisely known than those of many fission products, it is occasionally used as a standard or base reaction to standardize other observations.
ASTM E393 Testing Procedure and Requirements
In ASTM E393, the fission dosimeter is allowed to cool for five days or longer for nondestructive analysis. 10 mg Ba/mL Barium Carrier is used. The daughter product of 140Ba, 140La, has a 1.596-MeV gamma energy peak, which is counted. The reaction fission rate is calculated using this information, the decay constants for the La and Ba, and the fission yield of the 140Ba. The equivalent fission fluence rate is calculated using an appropriate cross section and a reaction rate. The fission product 140Ba is isolated from the irradiated fission dosimeter for destructive analysis. Counting the 0.537 MeV gamma-ray peak determined the activity of the 140Ba.
ASTM E393 Results Analysis and Interpretation
The nondestructive determination of 140Ba by direct counting of 140La many days after irradiation is performed along with the chemical separation of 140Ba and subsequent counting of 140Ba or its daughter 140La.
Barium content is calculated as
Ba++, mg/mL = (W/V) × 0.5421
Where:
W= milligrams of BaCrO4
V = milliliters of carrier used
FAQ
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You can share your astm e393 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm e393 test to various testing techniques.
How much do I need to pay for the astm e393 test?
Please contact us for a detailed quote for your astm e393 testing needs. Cost incurred to carry out different astm e393 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm e393?
The required number of samples or specimens should comply with the procedure given in the astm e393 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm e393 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm e393 test?
The turnaround time for astm e393 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
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