Related Experiment Video
Updated: Jul 25, 2026
12:22
Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
Published on: November 9, 2015
Determination of the Pu240/Pu239 ratio by alpha spectrometry using the WinALPHA program
S Srinivasan1, H Seshadri, T Kumar
1Kalpakkam Reprocessing Plant, Bhabha Atomic Research Centre Facilities, Kalpakkam 603 102, India. ssv@igcar.ernet.in
Summary
Determining the plutonium isotopic ratio (240Pu/239Pu) is crucial for origin identification. A new computer program, WinALPHA, accurately analyzes alpha spectra, offering a cost-effective alternative to mass spectrometry for plutonium samples.
Area of Science:
- Nuclear Chemistry
- Radiochemistry
- Analytical Chemistry
Background:
- The plutonium isotopic ratio (240Pu/239Pu) is vital for identifying plutonium origins.
- High-resolution mass spectrometry provides accurate measurements but is expensive.
- Alpha- and gamma-spectrometry are lower-cost alternatives, but spectrum analysis presents challenges.
Purpose of the Study:
- To evaluate the efficacy of the WinALPHA computer program for analyzing plutonium alpha spectra.
- To determine the plutonium isotopic ratio (240Pu/239Pu) in power reactor fuel reprocessing samples.
- To compare the accuracy of WinALPHA-derived results with established mass spectrometry techniques.
Main Methods:
- Quantitative analysis of alpha spectra using the WinALPHA computer program.
- Application of WinALPHA to plutonium samples from power reactor fuel reprocessing.
- Comparison of results with high-resolution mass spectrometry data.
Main Results:
- The WinALPHA program was successfully employed to analyze plutonium alpha spectra.
- Plutonium isotopic ratios derived from WinALPHA showed excellent agreement with mass spectrometry.
- The agreement between WinALPHA and mass spectrometry was within 1-2%.
Conclusions:
- The WinALPHA program offers a reliable and cost-effective method for determining plutonium isotopic ratios.
- This approach provides a viable alternative to expensive mass spectrometry for plutonium analysis.
- Accurate isotopic ratio determination using WinALPHA aids in identifying plutonium origins.
More Related Videos
Related Concept Videos
01:14UV–Vis Spectrometers
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
01:29UV–Vis Spectroscopy: Woodward–Fieser Rules
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
01:22Atomic Absorption Spectroscopy: Instrumentation
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
The atomizer used in AAS can be either a flame atomizer or an...
01:25Atomic Absorption Spectroscopy: Atomization Methods
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the aerosol...
01:21Atomic Absorption Spectroscopy: Lab
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
01:29Atomic Emission Spectroscopy: Lab
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...