Spectroscopy- and Counting detectors

1. Special Features

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CXS-S5-F: with window comparator

  • rugged solid state sensors with high efficiency at smallest detector space
  • smallest packaging size
  • y- and X-ray energy range from 2 keV up to several MeV and 30 keV up to 2 MeV for ß-rays
  • energy resolution about 1 keV at 5 keV without cooling
  • amplifier and discriminator electronic full inte-grated in detector package
  • direct operating with MCA or counter; test signal input; timing signal for coincidence mode
  • customer specific modifications and special de-signed sensor heads

2. Intended use

Radiation sensors of series CXS-S are used for de-tecting ß-, y- and X-rays. They are operating in the spectroscopy as well as in counting mode for intensity monitoring. The large number of available sensor-heads, allow the entire energy range from 2 keV to several MeV to be detected.

The devices can be used in X-ray fluorescence analytic, in X-ray-diffractometry, at HPLC-systems, in the traditional absorption measuring technology, at contamination measure-ments, in medicine and radiation protection. The active areas of the detector heads range from 2 and 400 mm² and scintillation crystals with absorption depths up to 50 mm can be used. This ensures optimal adaption for virtually all measuring tasks.

Detectors with active areas between 2 and 20 mm² are special suited for spectroscopic applications with medium energy resolution and as fast counters. The large area detectors are primarily used for intensity monitoring in counting mode. The ß-sensors have a very low y-background sensitivity and are highly efficient for x-rays in all in air detectible nuclides. All detectors can operate directly together with an MCA or counter without any additional electronics.

They are the optimal solution wherever small and compact sensors with integrated electronics are needed. Additionally, the packaging concept makes it possible, that linear detector arrays with a pixel distance of 10 mm and of any length can be arranged simplest.

3. Design & Function

All detectors of series CXS-S… are constructed following the same basic principle. In a compact housing the detector head and the nuclear elec-tronics is contained. This SMD electronics includes a charge sensitive amplifier, a filter main-amplifier and an adjustable threshold discriminator. It is adapted to the used detector head and ensures optimal spectroscopic and dynamic properties for the detection unit.

As sensor heads you can use Si-photodiodes of 2-80 mm² area ( > 80..400 mm² in customer specific packaging), scintillation crystals (CsI, BGO, CdWO4) and plastics with photodiode read-out, and CdTe-sensors with max. 16 mm² area. The sensitive area, the sensor material and the sensor geometry can be adapted for the measuring task.

Small-sized Si-diodes are used for low-energy y- and X-rays, which achieve about 1 keV energy resolution at room temperature; scintillation detectors with photodiode read-out are used at energies of larger than 50 keV with an energy resolution of approx. 30 keV at 660 keV.

This new detector generation does not require any high-voltage power supply, is insensitive to mechanically shocks and magnetic and electric fields. Depending on measuring task and the sensitive area the sensor head is at the front or at the side of detector packaging.

The signal output and power supply occur by a single 4-fold BNC-cable connector.