C-14 high sensitivity measurement device based on gas sampling and positive ion source

Abstract

The invention relates to a C-14 high sensitivity measurement device based on gas sampling and a positive ion source. The device comprises a microwave ion source for generating positive ions of carbon;the microwave ion source is connected with a charge exchanger; the positive ions of carbon are converted into negative ions through the charge exchanger; the charge exchanger is connected with an injection magnet; the injection magnet injects the negative ions of carbon into an acceleration and gas stripping system through a beam focusing system; when disintegrating molecular ions, the acceleration and gas stripping system strips the negative ions of carbon so as to obtain positive ions, and then accelerates the positive ions; the acceleration and gas stripping system is connected with an analysis magnet and an electrostatic analyzer; the analysis magnet removes the disintegrated molecular ions, separates 14C, 13C and 12C from one another, and makes 14C enter the electrostatic analyzer; and the electrostatic analyzer is connected with a detector. With the device of the invention adopted, the rapid and efficient measurement of a 14C sample is realized, and a requirement for small-scale14C high-sensitivity measurement can be satisfied.

Description

technical field [0001] The invention relates to radioisotope measurement technology, in particular to a C-14 high-sensitivity measurement device based on a positive ion source for gas sampling. Background technique [0002] 14 C is a cosmogenic nuclide with a half-life of 5730±40 years. Due to the existence of the carbon cycle, over a long period of time, 14 C will continue to accumulate, decay and regenerate in the atmospheric environment and biological environment until it reaches a dynamic equilibrium. Therefore, 14 C is widely used in natural sciences such as archaeology, geology, and life sciences. 14 C has such a wide range of applications, the accuracy of the measurement method, the stability of the measurement tool and the efficiency of the measurement time are the guarantee 14 An important prerequisite for C applications. Tradition 14 The C measurement method is mainly based on liquid scintillation counting method, and its basic principle is based on the fluo...

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Problems solved by technology

However, all of these devices have a common feature of extracting negative ions from the ion source, and to extract negative ions, the sample needs to be prepared in the form of graphite. The graphite preparation process is time-consuming and laborious, and these negative ion source systems also have low ionization efficiency. Need to clean the ion source, need to use defects such as cesium and target cone

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