1. NSC KIPT
  2. IFTTMT
  3. Department of pure metals, physics of metals and technology of new materials
Ru En Ua

Scientific-researching laboratory of new technological developments

Dosimetry and spectrometry

Dosimetry ↑

Dosimetry characteristics od CdZnTe detectors ↑

Breadboard models of CdTe and CdZnTe dosimeters are developed for operation in counting and continuous mode of operation. Dosimetric performances are tested in a vide range of γ-ray dose rates (10–5 - 104 R/h) and energies (10 keV - 1.2 MeV). Having small size and weight, they have high discrete and analog sensitivity (~ 50 count/μR and ~2×10–5 C/R at 662 keV and with the size 50 mm3). Maximum relative measurement error of doze rate is 20 % (with the confidence level of 0.95) in the whole investigated range of dozes and energies.

Count rate response of CdTe detector for 241Am.
Count rate response of CdTe detector for 137Cs.
Count response for 60Co of the detector unit with 400 mm3 CdTe sensor.
Calibration characteristics of the commercial detector module BDMG-41 compared to detector module BDRG-T with CdTe detector.

Correction of the energy dependence at the registration of gamma-radiation ↑

The effect of filters on the γ-quanta registration effectiveness was simulated for CdTe (CdZnTe) detectors with simple metal filters from Al, Сu, Cd, Sn, Pb, W of different width, with simple filters with different area of perforation, and with composite filters from different metals either with perforation or without it.

Registration efficiency of γ-rays by CdTe (CdZnTe) detector without filter (1) and with a filter (2).

Emergency dosimeter for NPP ↑

BDBG-02 dosimeter was developed and manufactured for emergency situations at NPP. The dosimeter was tested at dosimetric calibration installations "ETALON-1M", UGV-1 and UGV-2 with 137Cs and 60Co sources. The tests were carried out also at “RADON” radioactive waste storage of the Kharkov region.

Effective range of gamma-ray dose rate is from 10 to 5000 R/h.

The data can be transmitted by cable at 50 m distance.

Output voltage of the I/V-converter of a CdZnTe emergency detector module as function of the dose rate of 60Co γ-radiation.
Current characteristic of CdTe and CdZnTe dosimeters for intensive X-rays.

Spectrometry ↑

The ability to operate without cryogenic cooling allows to manufacture with CdTe and CdZnTe handy and easy-to-use equipment for gamma-spectroscopy. Detectors are equipped with Be windows (10-50 μm) of in-institute fabrication.
Breadboard of hand-held gamma-ray spectrometer
Spectrum of 241Am, measured with CdZnTe detector module.
Spectra of 55Fe and 241Am taken with CdZnTe detector cooled at –30 °С.
Energy spectrum of fuel containing masses from Chernobyl “Shelter”.
Gamma-ray pulse height spectrum of 99Mo nuclide activated with 15 MeV γ-quanta.
Applications: radionuclide analysis of the fuel containing masses, monitoring of the coolant of the NPP primary circuit, monitoring of fission products in nuclear waste.