X-ray source of pyroelectric crystal

A pyroelectric and crystal technology, applied in the field of physical instruments, can solve problems such as hot cathode consumption, high power, and high cost

Inactive Publication Date: 2003-08-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high voltage used in the working process, necessary insulation and protection must be used, and the hot cathode also consumes a large amount of power, so the instrument is larger in size and more expensive.

Method used

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  • X-ray source of pyroelectric crystal
  • X-ray source of pyroelectric crystal
  • X-ray source of pyroelectric crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: made as image 3 The X-ray emitter shown has a shell of φ30×80mm aluminum cylinder, and 0.2 grams of Y zeolite molecular sieve is placed in the shell as a getter, and the vacuum is pumped to 5×10 -3 torr to seal the case. The size is 8×5×2.5mm 3 LiTaO 3 The crystal is the emitter, 5mm away from the surface of the crystal, a 0.1mm thick iron-plated aluminum film is placed as a target, and the iron film faces the crystal. Two pieces of TES1-1703 semiconductor cooling plates are used in series to cool the crystal. Both the heater and the refrigerator are powered by a DC stabilized power supply with a voltage of 3-6V. The heating current is 0.5A, the duration is 3 minutes, the maximum temperature of the platinum resistance is 100-120°C, the cooling current is 2A, the duration is 5 minutes, the minimum temperature of the platinum resistance is 3-5°C. A high-purity germanium detector is used to detect the emitted X-rays, and the integral counting rate is ab...

Embodiment 2

[0019] Embodiment 2: The structure of X-ray emitter is schematically shown as image 3 , the shell is a φ30×80mm aluminum cylinder, and 0.2 grams of Y zeolite molecular sieve is placed in the shell as a getter, and the vacuum is pumped to 5×10 -3 torr to seal the case. The size is 8×3×2mm 3 cesium nitrate (CsNO 3 ) crystal as the emitter, 5mm away from the surface of the crystal, place 0.1mm thick gold foil as the target. The heater is not used during normal operation. The semiconductor refrigerator adopts three-stage refrigeration, the cooling current is 4A, and the duration is 5 minutes, and then the power is turned off to allow it to heat up naturally. During the heating process, a high-purity germanium detector is used to detect the emitted X-rays, and the characteristic spectral lines of gold Au L can be clearly seen in the accumulated energy spectrum obtained α (9.7keV) and Au L β (11.4keV).

Embodiment 3

[0020] Embodiment 3: The structure of the X-ray emitter is schematically shown as image 3 , the shell is a φ30×80mm aluminum cylinder, and 0.2 grams of Y zeolite molecular sieve is placed in the shell as a getter, and the vacuum is pumped to 1×10 -3 torr to seal the case. The size is 4×4×2.5mm 3 lithium niobate (LiNbO 3 ) crystal as the emitter, and a thin aluminum window with a thickness of 0.08mm at a distance of 10mm from the surface of the crystal doubles as a target. The semiconductor refrigerator is not used during normal operation, the heater operating voltage is 3-4V, the current is 0.3-0.4A, the heating duration is 5 minutes, and then stop the power supply and let it cool down naturally. During the cooling process, a beryllium window thin crystal NaI(Tl) detector is used to detect the emitted X-rays, and the integrated count rate can be obtained at 800-1100 / s.

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Abstract

The present invention relates to one kind of X-ray source of pyroelectric crystal. The X-ray source casing has leads in one end and thin aluminum window in the other end. There are one heating pedestal with built-in heater in the center of the casing; one crystal set in the end near the window on the heating pedestal; one film target set belongs to the the crystal and the window; one refrigerator set inside the heating pedestal and opposite to the heater; and one heat radiator set outside the refrigerator and connected to casing. Being small and cheap, the crystal X-ray emitter of the present invention is suitable for use in various industrial sensor and portable instrument and especially in X-ray teaching demonstration and experiment instrument.

Description

technical field [0001] The invention relates to a pyroelectric crystal X light source, belonging to the technical field of physical instruments. Background technique [0002] In today's industry, various X-ray instruments are widely used in medical and health departments, universities and research institutes. The X-ray light source generally uses X-ray tubes. figure 1 Shown are currently popular X-ray tubes. Its working principle is to use high voltage (above 30KV) to accelerate the electrons emitted by the hot cathode tungsten wire 4 to bombard the metal target 5 to excite the target atoms to emit X-rays. Due to the high voltage used in the working process, necessary insulation and protection must be adopted, and the hot cathode also consumes a large amount of power, so the instrument is larger in size and more expensive in cost. When the high-speed electrons reach the surface of the anode (target), the movement of the electrons is suddenly blocked. According to the elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J35/00
Inventor 何元金万年胜
Owner TSINGHUA UNIV
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