Amptek MINI-X Compact X-ray Tube

Overview

The Amptek MINI-X is a compact, integrated microfocus X-ray source engineered for portable and benchtop X-ray fluorescence (XRF), energy-dispersive X-ray spectroscopy (EDS), and transmission-based analytical systems. Unlike conventional X-ray tubes requiring separate high-voltage generators and cooling infrastructure, the MINI-X integrates the X-ray tube, high-voltage power supply, control electronics, and thermal management into a single 360 g module. It operates on a stable 12 VDC input and communicates via USB, enabling seamless integration with embedded controllers, laptops, or OEM instrumentation platforms. The tube utilizes a transmission-target geometry—where electrons strike a thin metallic film (Ag or Au) deposited on a beryllium substrate—and emits characteristic X-rays through a 127 µm Be window. This design delivers high photon flux per unit power while maintaining low thermal load and mechanical footprint. Its 120° output cone angle supports broad-field excitation, and its grounded anode architecture simplifies electrical grounding in detector-coupled configurations—critical for low-noise spectral acquisition in handheld or field-deployable analyzers.

Key Features

• Integrated HV & Control Architecture: Combines tube, 50 kV/200 µA HV supply, and USB interface in one sealed, air-cooled housing—eliminates external HV cabling and reduces EMI susceptibility.
• Transmission-Target Design: Thin-film Ag (0.75 µm) or Au (1.00 µm) targets mounted directly on Be substrate maximize X-ray yield per watt and minimize bremsstrahlung background at low energies.
• Sub-Second Settling Time: Voltage and current stabilize within <1 second after command, supporting rapid duty-cycle modulation and pulsed excitation protocols.
• Low-Power Operation: Draws only 9 W at full output (50 kV / 80 µA); compatible with battery-powered systems and enables >8-hour operation on standard 12 V Li-ion packs.
• Compact Mechanical Profile: 2 mm effective focal spot and minimal target-to-window distance enhance geometric efficiency—enabling shorter source-to-sample distances and tighter system packaging.
• Ruggedized Safety Compliance: Includes hardware interlock, visual (flashing LED) and auditory (beeper) fault indicators, and meets IEC 61010-1 requirements for Class I equipment with <5 µSv/h leakage at 5 cm when safety plug is engaged.

Sample Compatibility & Compliance

The MINI-X is optimized for excitation of elements from Na (Z=11) to U (Z=92) in solid, powder, and thin-film samples. Its Ag and Au targets provide strong Kα lines at 22.1 keV and 68.8 keV respectively—ideal for exciting mid-Z to high-Z elements in XRF and for generating tunable bremsstrahlung spectra in absorption or phase-contrast imaging setups. The beryllium window transmits photons down to ~1 keV, supporting light-element analysis when coupled with silicon drift detectors (SDDs) or Si(Li) detectors. The device complies with international electromagnetic compatibility (EMC) standards per FCC Part 15 Subpart B and CE marking directives. While not certified as medical radiation equipment, its operational parameters align with ISO 12718 (X-ray tube nomenclature) and ASTM E1316 (standard terminology for nondestructive testing). All firmware and control logic are designed to support GLP/GMP-aligned audit trails when integrated with validated host software.

Software & Data Management

Amptek provides two software layers: the graphical Mini-X Control application (Windows/macOS/Linux) for real-time voltage/current adjustment, dose monitoring, and fault logging; and the Mini-X API—a C/C++ and Python-compatible library enabling deterministic control within custom data acquisition frameworks. The USB interface supports synchronous command-response timing with sub-millisecond latency, allowing precise synchronization with detector gate signals or motion stages. All parameter changes are timestamped and logged locally. When deployed in regulated environments, the API supports integration with 21 CFR Part 11-compliant electronic lab notebooks (ELNs) via secure REST endpoints or OPC UA bridges—enabling full traceability of excitation conditions for QA/QC documentation and regulatory submissions.

Applications

• Portable and handheld XRF analyzers for mining, scrap sorting, and RoHS compliance screening.
• Benchtop micro-XRF mapping systems for geoscience, art conservation, and failure analysis.
• Embedded X-ray sources in OEM thickness gauges, coating analyzers, and semiconductor wafer inspection tools.
• Teaching and research platforms for X-ray physics, detector calibration, and radiation safety training.
• Low-dose radiography and phase-contrast imaging prototypes where compactness and controllability outweigh ultra-high brightness requirements.

FAQ

Can the MINI-X operate continuously at maximum power?
Yes—it is rated for 4 W continuous output at 100% duty cycle, provided ambient temperature remains ≤40 °C and airflow is unobstructed.
Is beryllium window handling subject to export controls?
Yes. Be windows fall under EAR99 classification; shipments outside the U.S. require compliance with Bureau of Industry and Security (BIS) guidelines.
What is the expected lifetime under typical usage?
Rated for 2000 operating hours or 1 year warranty—whichever occurs first. Lifetime correlates strongly with average current density and thermal cycling frequency.
Does the Mini-X API support real-time current/voltage feedback?
Yes—firmware returns actual kV/kµA values with ±0.5% accuracy via query commands, enabling closed-loop regulation in custom applications.
Can the tube be operated without the included AC adapter?
Yes—any stable 12 VDC source delivering ≥1 A is sufficient; battery packs, PoE injectors, or vehicle power systems are commonly used in field deployments.