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Introduction

1.1

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

(1) 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 cm

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.

Photograph of complete X-123 (left) and a typical

X-123 User Manual

aluminum box. The detector is mounted on an

Fe spectrum (right).