Measuring the half-life of 126Sn by thermal ionization mass spectrometry (CAT#: STEM-ST-0213-LJX)

Introduction

The abundance of long-lived radionuclides and their daughter products provides information on the chemical evolution of the system where they are found. Knowledge of the decay constants for these radionuclides permits to quantify evolutionary histories at time scales, which are comparable to their half-lives.
Because the half-life of 126Sn is short as compared to the age of the solar system, there is no 126Sn left from nucleosynthesis. 126Sn in the present terrestrial environment is therefore limited to contributions from spontaneous fission of 238U and to anthropogenic input. The service determined of the isotope abundance of 126Sn in the same material by thermal ionization mass spectrometry (TIMS) , which minimizes the error contribution to the overall uncertainty of the decay constant.

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Principle Applications Procedure Materials Notes Related Products

Principle

Thermal ionization mass spectrometry exploits the thermochemical reactions that occur in molecules in a sample when they are irradiated by a beam of high energy electrons. This reaction usually takes place at high temperatures, resulting in the formation of ions. The ionized species are accelerated in an electric field and then analyzed by mass spectrometry through the ion-focusing lens of a mass spectrometer. The mass spectrometer will separate and detect the ions according to their mass and charge.

Applications

For analyzing the distribution of molecules, atoms and molecular groups.
For studying the chemical structure of Earth's minerals and rocks.
For studying the structure and function of biomolecules.
For studying problems in physics.

Procedure

1. The sampling system sends the sample to be analyzed into the ion source;
2. The ion source ionizes the atoms and molecules in the sample into ions;
3. The mass analyzer separates ions according to the size of the mass-charge ratio;
4. The detector is used to measure and record the intensity of the ion current to obtain the mass spectrum.

Materials

• Sample Type:
126Sn

Notes

Before starting the machine, check whether the water (water cooler), electricity, gas (argon/nitrogen), temperature, humidity, and exhaust air of the instrument are normal.

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