Radiometer RZB-07D “Tetra – B” is designed to control the contamination of workroom surfaces with beta – active radionuclides, equipment and other objects by measurement of the flux density of beta – particles.
Radiometer is used at nuclear fuel cycle facilities in the units responsible for controlling radiation situation.
| Measurement range of flux density of beta particles for 90Sr+ 90Y | 5 – 5·104 part/ min ∙cm2 |
| Sensitivity of the radiometer | No less than 0,25 с-1/min-1∙сm-2 |
| Limit of the basic relative error of the radiometer at p = 0,95 | ± (15 + 10/Ах) % * |
| Instability of the radiometer readings during 8 h of continuousoperation | Not more than 5 % |
| Level of the own radiometer background | No more 3 part/ min ∙cm2. |
| Operation mode setup time | No more than 2 min. |
| Working area of the detector | 30 cm2 |
| Radiometer is resistant to the values of MED of gamma-radiation | 10 mZv/h |
| Radiometer is powered by two batteries | size АА (R06) |
| Time of operation from two just charged batteries | No less than 12 h |
| Environment temperature | from -20°С to +50°С |
| Relative humidity | Up to 75 % at +30°С |
| Atmospheric pressure | from 84 to 106,7 kPa |
| Variable magnetic field of industrial frequency of the voltage | Up to 400 А/m |
| Level of casing protection | No worse than IP54 |
| Resisting to: • Temperature and humidity radiometer refers to Group B2a; • mechanical impact – group N2; • atmospheric pressure – group P1 in accordance with GOST 27451 • Type of climatic performance – GOST 15150 U1 |
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| It is functional after 5 min impact of alpha radiation with flow density of | Up to 5∙107 part/ min ∙cm2 |
| Additional error at max. influencing factor | No more than 25 % |
| Mean time between failures | No less than 8000 h |
| Average lifetime | No less than 10 years |
| Overall dimensins | Ø90×120×210 mm |
| Weight of the radiometer | No more than 1,5 kg |
* – Ах –numeric measured value
Features:
- There are two channels: the main channel and the compensative one in the device. Type of the detectors – Geiger and Muller counters;
The displaycontains informationaboutduration ofmeasurement cycle,degreebatteries dischargeandmagnitudeof the statisticaluncertainty of the measurement result.