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GAMMA-1S

Scintillation gamma spectrometer

 

Intended use

Quantitative estimation of radioactivity level and identification of radionuclides in samples of various types.

The spectrometer allows solving such traditional tasks of spectrometric analysis as monitoring the specific activity of gamma-emitting radionuclides in environmental samples (food products, animal feed, vegetation, soil, building materials and raw materials for them, forestry products, surface water and bottom sediments, finished products, metal alloys, components). It can also be used for radiation monitoring and control of technological processes and inspection for radioactive contamination.

 

 

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Description

Application

The spectrometer is used in laboratories and by services engaged in radiation monitoring of environmental objects and various products during their extraction, processing, and release.

Design and operation

GAMMA-1S is a NaI(Tl) 63×63 mm based digital scintillation gamma detecting device UDS-GC-63×63-USB placed inside a lead shield. The lead shield helps reduce the influence of external gamma background and reduce the activity measurement error.

The sample to be measured is prepared in accordance with the applied sample preparation technique, placed in the standard measurement geometry and installed in the shield on the detecting device cover to perform measurements. The following measuring geometries can be used: Marinelli vessel 1 l, Dent vessel 0.12 l, Petri dish 60 ml.

GAMMA-1S comes with an operator’s workstation with installed specialized software (SpectraLineBG) used to manage accumulation, display, processing of information and output of processing results to external computer devices.

Optionally, GAMMA-1S can include equipment based on activated carbon for comprehensive monitoring of radon in industrial conditions, residential homes, and in the environment.

Features and functional capability

  • Integrated gain stabilization system based on the LED reference peak ensures high stability of the detecting device, thus eliminating the need of daily energy calibration of the spectrometer
  • Non-potassium photomultiplier (PMT) used in the detecting device ensures obtaining low values of the minimum measured activity of radionuclides
  • The possibility of software, hardware and methodological coupling with the BETA-1S Scintillation Beta Spectrometer
  • Wide range of functions to work with spectra and results of their processing: measurement with time exposure (live or real time), automatic accumulation and processing mode, visualization on the monitor screen, storage in database
  • Generation of protocols in accordance with regulations in force; reports are issued on the following product categories:
    • building materials
    • mineral fertilizers
    • ceramics
    • food industry products
    • minerals
    • forest products
    • metals
  • Printing out of processing results and spectrum
  • Applied digital signal processing methods ensure the stability of the UDS-GC parameters in high load conditions
  • Individual adjustment for specific measuring tasks of the customer is possible
  • Efficiency calibration of the spectrometer is done for a 1 litre Marinelli vessel geometry. Calibrations using other geometries are also possible

Specifications and Performance

Operating range of detected gamma energies

0,05 to 3 MeV
Relative energy resolution for 662 keV (¹³⁷Cs) peak

8 % max
Integral non-linearity

1 % max
Maximum statistical load

150.000 cps min
Range of measured specific activity (the lower limit of the measuring range is defined as the minimum measurable activity (MIA) for a measurement time of 2 hours and an error of 50 %, the measurement geometry is a Marinelli vessel 1 l, with water.)

Cs-137: 1.5 to 10⁵ Bq/kg
K-40: 25 to 10⁵ Bq/kg
Th-232: 3 to 10⁵ Bq/kg
Ra-226: 3 to 10⁵ Bq/kg
Confidence limits of activity measurement error (P = 0.95)

±(10 to 50) %
Operating mode setting time

30 minutes max
Continuous operation

24 hours min
Time instability for continuous operation period

±1 % max
Operating geometries

volumetric, not exceeding 1 l
density of measured samples not exceeding 3g/cm³
Power supply

~220 V, (50±1) Hz, 250 V·A
Operating conditions

+10 to +35 °С, 75% at +30 °С and lower temperatures without moisture condensation
Overall dimensions

560×595×772 mm (Ekran-1SG protective shield)
Ø88×345 mm (UDS-GC-63×63-USB detecting device)
Weight

231 kg (Ekran-1SG protective shield)
2.3 kg (UDS-GC-63×63-USB detecting device)

Certification

Certification

  • GAMMA-1S is registered in the State Register of Measuring Instruments under No. 15294-08
  • GAMMA-1S complies with the requirements for products of safety class 4N according to OPB-88/97
  • GAMMA-1S complies with the Customs Union Technical Requirements “Safety of Low Voltage Equipment” (CU TR 004/2011) and “Electromagnetic Compatibility of Technical Means” (CU TR 020/2011)

Measurement procedures

  • Certification of the radiation monitoring method “Activity of radionuclides in investigated samples. Measurement procedure for gamma spectrometers using the SpectraLine software” No. 43151.4B207/01.00294-2010
  • Certification of metal radiation monitoring method No. 40090.1D522
  • Certification of “Methods of measuring the total volumetric activity of iodine-131, -132, -133, -134, -135 radionuclides in samples of aqueous process media at NPPs using MIS membranes and the GAMMA-1S gamma spectrometer”
  • Certification of “Methods of measuring the volumetric activity of gamma-emitting radionuclides (Ba-133, -139, -141; Sr-91, -92; Cs-134, -136, -137, -138; I-131, -132, -133, -134, -135) samples of aqueous process media at NPPs using block sorbents and the GAMMA-1S gamma spectrometer”
  • Certification of “Methods of measuring the volumetric activity of radionuclides 90Sr+90Y; 137Cs, 60Co, 54Mn, 133Ba, 88Y, 65Zn, 22Na in indoor air aerosols and beta radionuclides activity in samples of surface contamination acquired with the GAMMA-BETA-1S spectrometer”

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