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2. Introduction

2.1.

X-123 Description

The X-123 combines, in a single package, Amptek's high performance X-ray spectroscopy components: an X-ray

detector (options include the FastSDD, SDD, SiPIN, or CdTe) and preamplifier, (2) the DP5 digital pulse processor and

MCA, and (3) the PC5 power supply. The result is a complete system which can fit in your hand with no performance

compromise. It requires only +5 VDC power and a standard communication interface. With the X-123, anyone can

rapidly obtain high quality X-ray spectra.

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 pulse processor is the DP5, a second-generation digital pulse processor (DPP) which replaces both the shaping

amplifier and MCA found in analog systems. The digital technology improves several key parameters: (1) better

performance, specifically better resolution, and higher count rates; (2) greater flexibility since more configuration

options are available, selected by software, and (3) improved stability and reproducibility. The DPP digitizes the

preamplifier output, applies real-time digital processing to the signal, detects the peak amplitude, and bins this in its

histogram memory. The spectrum is then transmitted to the user's computer. The PC5 supplies the power to the

detector, including low voltages for the preamps, high voltage to bias the detector, and a supply for the thermoelectric

cooler which provides closed loop control with a maximum temperature differential of 85 °C. All of these are under

software control. The X-123SDD input is unregulated +5 VDC with a current of about 400-900 mA, depending on

configuration.

The complete system is packaged in 7 x 10 x 2.5 cm3 aluminum box. The detector is mounted on an extender; with

lengths from 3/8" to 9" (vacuum flanges are available). In its standard configuration, only two connections are

required: power (+5 VDC) and communications (USB, RS232, or Ethernet). An auxiliary connector provides several

additional inputs and outputs, used if the X-123 will be integrated with other equipment. This includes an MCA gate,

timing outputs, and eight SCA outputs. The X-123SDD is supplied with data acquisition and control software. It also

includes a Software Development Kit (SDK), to integrate the unit with custom software. Optional accessories include

software for analyzing X-ray spectra, several collimation and mounting options, and X-ray tubes to complete a compact

system for X-ray fluorescence.

2.2.

Photograph below of complete X-123 (left) and a typical 55Fe spectrum (right).

X-123 User Manual