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АО "НПЦ "АСПЕКТ" > Products > Laboratory spectrometers > GAMMA-1P

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GAMMA-1P

Gamma semiconductor spectrometer

Intended use

The GAMMA-1P laboratory precision gamma semiconductor spectrometer is used for qualitative and quantitative analysis of complex radionuclide samples

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Category: Laboratory spectrometers Tags: Environmental monitoring, Nuclear power industry
  • Description
  • Specifications and Performance
  • Certification

Description

Application

GAMMA-1P is used in laboratories of external dosimetry services, environmental services, radiological laboratories of concerned ministries and departments to control various environmental samples for the presence of gamma-emitting radionuclides, also in radiochemical laboratories to control technological processes. The spectrometer can be used in nuclear physics centers for research in various areas of fundamental and applied physics.

 

Design and operation

GAMMA-1P includes a semiconductor detecting unit, a spectrometric device, a lead protective shield, an operator’s workstation.

The semiconductor detecting unit converts the energy of gamma rays into electrical signals proportional in amplitude for their subsequent processing. The type of the semiconductor detector is selected to meet the customer’s specifications.

The spectrometric device is used to receive spectrometric information from the semiconductor detector. The choice of a specific model of the spectrometric device is determined by the tasks and needs of the customer.

The lead protective shield reduces the level of the external gamma background recorded by the semiconductor detector thus increasing the spectrometer sensitivity. Whereas the most common solution for GAMMA-1P is the Ekran-2P protective shield (stationary floor shield of the original design, lead shield thickness is 82 mm, copper is 1.5 mm, cadmium is 1 mm), other models varying in lead thickness, measuring chamber volume, special features like collimator, are available. For some applications, such as high activity samples, there may be no need for a shield.

The operator’s workstation with installed specialized software allows you to manage accumulation, display, processing of information and output of processing results to external devices. The basic software for GAMMA-1P is SpectraLineGP. SpectraLine Handy or SpectraLine Ultimate can be used instead. NuclideMaster, NuclideMasterPlus, EffMaker are used as additional software that expands the range of tasks to be solved.

GAMMA-1P can come with various accessories: containers and devices for sample measurements, positioning devices, devices for filling the detector with liquid nitrogen, and a desk for equipment.

 

Features

  • The spectrometer composition depends on the tasks, needs and capabilities of the customer
  • Efficiency calibration of the spectrometer is done for a point 5 cm, point 25 cm, and 1 l Marinelli vessel geometries. Calibrations using other geometries are also possible upon the customer’s request
  • The detector is characterized to correct the radionuclide library for true summation

Specifications and Performance

Range of detected gamma energies

0.05 to 10.0 MeV

Range of measured gamma energies

0.05 to 3.0 MeV

Number of analyzer channels

8192 or 16384 depending on the spectrometric device used

Energy resolution for gamma line with the energy

122 keV (⁵⁷Co): 0.8 keV max (typical value)
1332 keV (⁶⁰Co): 1.8 keV max (typical value)

Relative detection efficiency at the peak of total absorption of gamma quanta for point geometry ⁶⁰Co along a line with an energy of 1332 keV, at a source-detector distance of 25 cm (depending on the volume of the detector used)

10 % min (efficiency depends on the selected SCD)

Integral nonlinearity

0.05 % max

Maximum statistical input load

5×10⁴ or 1×105 cps min (depending on the spectrometric device used)

Minimum measured activity of ¹³⁷Cs in a sample with shield application for 1 hour measurement

1.5 Bq max

Confidence limits for activity measurement error (P = 0.95)

±( 5 to 30) %

Operating mode setting time

30 minutes max

Continuous operation

24 hours min

Time instability for continuous operation period

±0.1 % max

Power supply

(50±1) Hz, ~220 V

Operating conditions

+10 to +35 °С
humidity up to 75% at +30 °С and lower temperatures without moisture condensation

Certification

Certification

  • GAMMA-1P is registered in the State Register of Measuring Instruments under No. 18392-08
  • GAMMA-1P complies with the requirements for products of safety class 4N according to OPB-88/97
  • GAMMA-1P 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 metal radiation monitoring method No. 40090.1D522
  • 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 the measurement procedure “Method of performing measurements of the volumetric activity of gamma-emitting radionuclides in samples of aqueous and gas process media of nuclear power plants using a semiconductor gamma spectrometer” No. 803/05
  • Certification of the measurement procedure “Method of measuring the volumetric activity of gamma-emitting radionuclides in samples of aqueous process media of nuclear power plants and in liquid radioactive waste using the GAMMA-1P spectrometers” No. 14-14-023 M

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JSC SPC ASPECT
8 Sakharova A.D. Street
141980 u.d. Dubna, Dubna
Moscow region, Russia

 

E-mail: aspect@dubna.ru
Phone: +7 496 216-52-72
Fax: +7 496 216-51-08

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