«SPE «TETRA» Ltd.
Devices of radiation and
technological control
   

Radiometer RAS-01-

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Radiometer RAS-01-   Radiometer RAS-01-

Purpose and operation mode

Radiometer is aimed to measure of volume activity of radioactive aerosols which are caused by artificial (technogenic) alpha- and beta-emitting nuclides in the air.

The technical features of radiometer meet the requirements International Electrotechnical Commission series 761 (p.1,2) «Equipment for continuous monitoring of radioactivity in gas emissions» and IEC 61578.

The operation mode is based on analyse of the energy distribution of particles emitted by radionuclides which has left on the filter in the result of pumping air through it.

Radiometer provides measurement of volume activity of radioactive aerosols in the combined (for operational control) and separated (to determine the daily emission) modes.

Certificate

To aspirate of aerosols and measure of accumulated activity on the filter are made simultaneously in the combined mode, and the value of the aerosol volume activity is calculated according to the algorithms of detection, accumulation and average hourly measurements.

To measure of accumulated activity of aerosols is made after sampling in the separated mode.

Application areas

Continuous automatic control of concentration of radioactive aerosols in the independent mode or as a part of automation radiation monitoring systems in the air at nuclear power and industry facilities:

  • workplaces;
  • ventilation systems.

Operation mode:

  • a stationary measuring device with own pump block or with work from external sampling line;
  • a portable measuring device on a trolley with pump block;
  • a point of continuous control in a radiation control system with ability of transfer data to a local network.

Features:

  • silicon spectrometric detectors;
  • compensation of the contribution of radon radiation and external gamma background;
  • built-in air flowmeter;
  • communication interface RS-485;
  • work with own pump block or with external sampling line, control of solenoid valves when working with external sampling line;
  • economical movement of the tape by the frame;
  • control of tape breakage and filter clogging;
  • setting by means of the console and notebook;
  • ability of connection external block of indication and alarm.

Downloads

Radiometer RAS-01- (2.27 )

Specifications

Type of detectors - silicon, spectrometric

Quantity of detectors - 4 (2 measuring and 2 compensating)

Measurement range in separated measurement mode*:
– volume activity of alpha-emitting aerosols from 0,01 to 2,4·106 Bq/m3
– volume activity of beta-emitting aerosols from 0,05 to 3,0·106 Bq/m3
*Sampling time is 24 hours, volume speed of pumping is 40 l/min, equivalent equilibrium volume activity of radon is no more 50 Bq/m3, exposure time is 4 hours, measurement time is 1 hour.
Measurement uncertainty of volume activity in the separated measurement mode with probability 0,95 no more 40%
Measurement range in combined measurement mode **:
– volume activity of alpha-emitting aerosols from 0,01 to 4,8·107 Bq/m3
– volume activity of beta-emitting aerosols from 0,1 to 1,6·108 Bq/m3
** Sampling time and measurement is 1 hour, volume speed of pumping is 40 l/min, equivalent equilibrium volume activity of radon is no more 50 Bq/m3.
Measurement uncertainty of volume activity in the separated measurement mode with probability 0,95 no more 40%
Energy range of registration:
– alpha-particles from 3,0 to 6,1 V
– beta-particles from 0,1 to 3,0 V
Air flow rate through a filter from 10 to 40 l/min
Measurement uncertainty of air flow rate with probability 0,95 ±7%
Types of filter tapes , FSLW
Power supply of the radiometer from AC mains 50 ± 2 Hz, voltage from 187 to 242 V
Power consumption:
– without a pump block no more 70 VA
– with a pump block no more 470 VA
Ambient temperature range from +5 to +50°C
Maximum relative humidity (within 2 hours) up to 100% at +50°C
Protection class not worse IP65
(IP20 for a pump block)
Average failure time no less 20 000 hours
Average service life no less 10 years
Dimensions 430x350x190 mm
Weight of radiometer:
– without pump no more 33 kg
– with pump no more 60 kg

Purpose indicators:

  • a radiometer by purpose refers to the elements of the system of normal operation, the impact on the safety of nuclear power plants - to systems and elements important for safety, third class;
  • analyse of energy spectre of particles on a filter by means 1024 channel AD converter allows to take into account the contribution of radon and thoron decay products, and calculate the activity of alpha- and beta-emitting man-made nuclides;
  • a radiometer measures consumption and pumped volume of air by means of the built-in flowmeter;
  • a radiometer controls its own pump block and can control external devices (for example, solenoid valves while working with an external sampling line).

Delivery set

Standard:

On request:

a detection device UDAS-01;

pump block BN-01;

a console USR-04-01;

set of mounting parts.

verification and configuration software;

an operation manual.