X-123 Description
Amptek’s specialty is X-ray spectrometers, which are small, low power, high performance, and simple to operate. The X-123 combines in a single package Amptek’s standard, high performance X-ray spectroscopy components: the XR-100CR detector and preamplifier, DP5 digital pulse processor and MCA, and PC5 power supply. The result is a complete integrated system which can fit in your hand. In many commercially available systems, the preamplifier alone has more size, mass, and power than this integrated system. It requires only 2 connections to run: +5 VDC power and a standard RS-232 or USB bus. With the X-123, anyone can rapidly obtain high quality X-ray spectra.
The typical detector is a Si-PIN photodiode: X-rays interacting in the silicon create an average of one electron/hole pair for every 3.62 eV of energy lost in the silicon, which is the input signal.
The detector is mounted on a thermoelectric cooler along with the input FET and coupled to a custom charge sensitive preamplifier. The thermoelectric cooler reduces the electronic noise in the detector and preamplifier, but the cooling is transparent to the user: it operates like a room temperature system. The charge-sensitive preamplifier uses a novel feedback technique, injecting reset pulses through the high voltage connection to the detector.
The pulse processor is the DP5, a digital pulse processor which replaces both the shaping amplifier and multichannel analyzer (MCA) found in most analog systems. The use of digital technology improves several key parameters: (1) better performance, specifically better resolution and operation at higher count rates; (2) greater flexibility since more configuration options are available and they are selected by software over a RS-232 interface, and (3) improved stability and reproducibility. The DP5 digitizes the preamplifier output, applies real-time digital processing to the signal, detects the peak amplitude (digitally), and bins this value in its histogramming memory, generating an energy spectrum. The spectrum is then transmitted over the DP5’s interface to the user’s computer. The Amptek DP5 has 6 main function blocks to implement these functions: (1) an analog prefilter; (2) an ADC; (3) a digital pulse shaper; (4) pulse selection logic; (5) histogram logic, and (6) interfacing hardware (which includes a microcontroller) and software.
The power supply is Amptek’s PC5, a single board. The input is approximately +5 VDC with a current of about 200 mA. The PC5 uses switching supplies to produce all the low voltages required for the digital processor and the preamplifier. It also includes a high voltage multiplier to produce the detector bias voltage, up to 400 V, and supply for the thermoelectric cooler which provides closed loop control with a maximum temperature differential of 85 °C. Both of these supplies are adjusted at the factory for a particular detector.
The complete system is packaged in 7 x 10 x 2.5 cm³ aluminum box, with the detector mounted on an extender. In its standard configuration, only two connections are required: power (+5 VDC) and serial (either USB or RS-232). The DP5 board supports several additional inputs and outputs, if the X-123 will be integrated with other equipment. This includes an MCA gate, a memory buffer select signal, timing outputs, and SCA ouputs. Please contact Amptek or see the DP5 specifications for further information.
Figure 2. X-123 Architecture and Connection Diagram