Optically stimulated luminescence dosage tester

Abstract

The invention relates to an optically stimulated luminescence dosage tester. The optically stimulated luminescence dosage tester comprises an excitation light source, a photomultiplier, a beam splitter, a tester upper cover, a sample tray, a tester machine body, a plastic optical fiber and an optical fiber travel mechanism, wherein the optical fiber travel mechanism is fixed on the tester upper cover, a magnetic flow travel mechanism or a worm and gear travel mechanism is adopted as the optical fiber travel mechanism, the plastic optical fiber comprises a single optical fiber core, an optical fiber coating layer and an optical fiber outer layer, wherein the diameter of the optical fiber core is 8-15mm; the optical fiber travel mechanism is connected with one end of the plastic optical fiber, the other end of the plastic optical fiber is divided into two paths by the beam splitter, and the two paths are respectively connected to the excitation light source and the photomultiplier; a detachable drivepipe and a focusing lens are arranged at the front end of the optical fiber travel mechanism of the optically stimulated luminescence dosage tester. The optically stimulated luminescence dosage tester uses large diameter plastic optical fiber, so that the optical coupling efficiency is improved, and the light source excitation strength is improved; the optical fiber travel mechanism can accurately control the position of the optical fiber, reduces the influence of the excitation light source on adjacent samples, and can be used for measuring common samples and single grain samples.

Description

technical field [0001] The invention belongs to the technical field of geological age measuring equipment, and relates to an optical luminescence dose meter, in particular to an optical luminescence dose meter with an optical fiber moving mechanism. Background technique [0002] The defects produced during the formation of solid mineral crystals and the radiation brought to it by the acquired environment will cause lattice defects inside the crystal, forming free energy storage electrons, and the energy storage electrons stored in the crystal are stimulated by external energy. Photons are emitted. The method of using light energy to excite mineral crystals is called optical luminescence. OSL is a kind of phosphorescence. For the same mineral crystal, under a fixed light source and the same excitation conditions, the total amount of OSL photons is proportional to the total amount of energy-storing electrons in the solid, that is, the radiation received by the crystal The do...

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Problems solved by technology

[0004] Some papers and patent documents that have been published so far have mentioned the use of optical fibers for the transmission of excitation light, but the interface loss is very large, and the influence of adjacent samples has not been considered.

The optical fiber in the prior art is an optical fiber bundle composed of multiple optical fibers. Not only the gaps between multiple optical fibers cannot pass light, but also the existence of the optical fiber coating layer reduces the effective light transmission area.

The usual optical luminescence test uses a sample lifting mechanism to lift the sample upwards, and the excitation light source directly illuminates the surface of the sample. This excitation method not only reduces the emission efficiency of the light source, but also affects the measurement of adjacent samples.

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