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High-sensitivity spectrometer TRIEL based on a liquid scintillator and it is intended for analytical and technological monitoring of the activity of alpha and beta-emitting radionuclides (for example, H-3, C-14, P-32, Sr-90+Y-90, Pu-238, Pu-241, Pu-242, etc.). The spectrometer provides a complete radioisotope analysis of alpha, beta-emitting radionuclides (with the possibility of detecting beta radiation with energies from 2 keV) and high detection efficiency (~ 100% for all alpha particles and for beta particles with energy> 50 keV).

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Liquid scintillation spectrometer TRIEL ®
Beta - and alpha - spectrometer and radiometer

Liquid scintillation counter

Liquid scintillation spectrometer TRIEL


Liquid Scintillation Spectrometer (Liquid scintillation counter) TRIEL is a device for registration (counting) of pulses arising from the interaction of alpha and beta particles with a liquid scintillator. The amplitude of the detected pulses is proportional to the energy of the particles that caused them, the pulse count rate is proportional to the activity of the measured counting sample.

The spectrometer consists of a light collection chamber with two PMT operating in the coincidence circuit and an electronic tract, including a high-voltage unit, a preamplifier, an amplifier, a multi-channel analyser, which measures the amplitudes of the pulse signals from the PMT and registers the received digital code in the buffer memory and further transfers information to the computer via USB or RS-485 interface.

The principle of operation of spectrometer is based on the complete absorption of the energy of charged particles in a liquid scintillator, the emission of this energy in the form of a light flash, the conversion of the flash energy into an electrical pulse and the registration of these pulses using two PMTs. The analog signals from each PMT after amplification and formation go to coincidence circuit for selection during the resolving time. The signal from the output of the coincidence system goes to the input of the MCA in which it is converted into a digital code proportional to the absorbed energy. The resulting codes are accumulated in the computer's memory and form a spectrum of radiation energies.

The software allows you to control the operation of the spectrometer, process spectra, and also identify radionuclides and calculate the activity in the counting samples. The processed results and spectra can be stored as files on computer storage devices or presented as reports. The software ASW3L and SpectraDec have embedded various methods of define the quenching levels.

To solve some radiochemical tasks of identifying and measuring the activity of radionuclides in samples it is possible to use measurement methods that should take into account the level of conformity of the counting and reference samples, the output coefficients during radiochemical concentration, and other relevant additional contributions to the error in determining the activities of radionuclides.


- spectrometer - radiometer TRIEL;
- set of vials 20ml;
- liquid scintillator;

- cables;

- analytical software for liquid scintillation analysis ASW3L and SpectraDec;

- additional set of lead chamber (optionally);

- Tablet PC (Windows) or PC.

Technical and metrological characteristics

The spectrometer provides a measurement of the energy distribution of
- beta radiation :
- alpha radiation:

1 – 4000 keV
2 - 10 MeV

Background count rate in tritium energy range:

0.5 cps (with an additional set of lead elements)

Range of measured activity of the beta-emitting radionuclides (U=50%, k=2):

0.05 Bq – 50kBq

Sensitivity for beta radiation of radionuclide
H-3 more than:
C-14 more than:
Sr-90+Y-90 more than:


The maximum throughput:

50 kcps

The instability measurements activity within 24 hours of continuous operation is no more than:


Count of channels:

1024, 2048, 4096

PC interface:

USB, RS485

Power supply:

110 – 240V, 50-60Hz

Dimensions (WxHxL):

223 x 218 x 473 mm

Operation temperature range :

+10 .. +40 °C

Relative humidity:


Power consumption:

< 5 W

List of radionuclides available for measurement:

H-3, C-14, Na-22, P-32, P-33, S-35, Cl-36, K-40, Ca-45, Mn-54, Fe-55, Co-57, Co-60, Ni-63, Zn-65, Kr-85, Sr-85, Y-88, Sr-89, Sr-90, Y-90, Tc-95, Tc-99, Pd-102+Rh-103m, Ru-106+Rh-106, Sb-125+Te-125, I-125, I-131, Ba-133, Cs-134, Cs-137, Pm-143, Ce-144+Pr-144, Pm-147, Sm-147, Gd-148, Eu-152, Eu-154, Pb-210, Bi-210, Po-210, Rn-222, U-238+daught, Ra-224+daught, Ra-226, Ra-226+daught, Ra-228+Ac-228, Th-230, Th-232+Th-228, Th-232+ daught, U-232, U-233, U-234, U-235, U-236, Pu-236, Pu-237, Pu-238, Pu-239, Pu-241, Pu-242, Np-237+Pa-233, Am-241, Am-243, Am-243+Np-239, Cm-244 ….


45kg (standard version)
65kg (with an additional set of lead elements)

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