Integrated X-ray Source with Carbon Nanotube Cathode
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Solution Overview
Problem
Current X-ray detection technologies, such as proportional counters and solid-state detectors, are limited by the need to collect charge carriers generated by one incoming X-ray photon before the next can be detected, leading to slow data collection and analysis in X-ray fluorescence (XRF) applications.
Innovation Solution
An X-ray source integrated on a chip, featuring a cathode of carbon nanotubes, a counter electrode, and a metal anode, with a shield electrode to control electron emission and X-ray generation, combined with an X-ray detector system that includes a layer of tungsten or lead for shielding and a semiconductor material for efficient X-ray photon detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If proportional counters or solid-state detectors are used for X-ray detection, then X-ray photons can be detected through charge carrier generation, but the detection speed is limited because charge carriers from one photon must be collected before the next photon can be detected
Solution Approach 1:
The invention segments the detection process by using multiple independent detector pixels arranged in an array. Each pixel operates independently to detect X-ray photons simultaneously, eliminating the sequential bottleneck. This parallel architecture allows multiple photons to be detected at the same time, dramatically increasing the data collection rate while maintaining detection precision.
2Device complexity
If an integrated chip design is used for X-ray source and detector, then device complexity is reduced and miniaturization is achieved, but shielding against direct X-ray interference between source and detector becomes challenging
Solution Approach 1:
The invention introduces a shielding layer as an intermediary element between the X-ray source and detector on the integrated chip. This shielding layer selectively blocks direct X-ray photons from reaching the detector while allowing the system to maintain its integrated compact design. The mediator enables the system to achieve both miniaturization and interference protection simultaneously.
3Power
If carbon nanotube cathode is used for electron emission, then field emission efficiency is improved, but precise control of electron emission and X-ray generation becomes more difficult
Solution Approach 1:
The invention implements dynamic control mechanisms for the carbon nanotube cathode, including adjustable voltage biasing and timing control circuits. These dynamic elements allow precise regulation of the field emission process, enabling the system to optimize electron emission intensity and timing according to detection requirements. The dynamic control transforms the inherently efficient but difficult-to-control carbon nanotube emission into a precisely manageable source.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables faster and more efficient X-ray generation and detection, allowing for higher throughput in XRF analysis and improved performance in applications like X-ray radiography, cargo scanning, and computed tomography by enabling simultaneous X-ray source and detector operation without direct X-ray interference.
Implementation Method 1
a cathode in a recess of a first substrate; a counter electrode on a sidewall of the recess, configured to cause field emission of electrons from the cathode
Implementation Method 2
a metal anode configured to receive the electrons emitted from the cathode and to emit X-ray from impact by the electrons on the method anode
Implementation Method 3
a semiconductor material for efficient X-ray photon detection
Data Source
AI summary
Disclosed herein is an X-ray source, comprising: a cathode in a recess of a first substrate; a counter electrode on a sidewall of the recess, configured to cause field emission of electrons from the cathode; and a metal anode configured to receive the electrons emitted from the cathode and to emit X-ray from impact by the electrons on the metal anode.