Detection unit BDLG-27-TE is used for detection of some slight changes in the flow density of gamma-radiation at background level and transformation them into proportional sequence of pulsed signals.
Output signal is a sequence of the normalized, statistically distributed pulses, contains measurable data about the density of the flow (equivalent dose power) of gamma-radiation.
| Initial energy limit of gamma-ray ragistration, keV | from 20 |
| Sensitivity to gamma radiation of isotopes:
– 137Cs imp·с-1 at 1 mkZv/h – 226Ra (type ЕR) imp·sec-1 at1 mg at a distance of 1 m |
2500
17500 |
| Measuring range of pulse signals when transforming the flow of gamma radiation pul/sec-1 | From 100 tо 50000 |
| Counting rate from natural radiation background (up to values 0.2 Sv • h-1) is not more than, imp • s-1 | 200 |
| Energy dependence of sensitivity *, % | Not standardized |
| Limits of the relative basic measurement error of the flow of pulse signals with confidence level of 0,95% | ± 10 |
| Data instability for 24 hours of continuous operation is not more than, % | 3 |
| Type of the detector | Monocrystal NaI(Tl) Ø 63×63 мм |
| Overall dimensions, mm | Ø 100 х 250 |
| Weight, kg | 7,0 |
| Length of the connecting cable, m | 6,0 (may be increased up to 200 м) |
| Note * – radiation of 137Cs radionuclide | |
ELECTRICAL CHARACTERISTICS
Power supply is voltage of 15 V (only +15 V is possible) . The consumed current is not more than 30 mA.
. Parameters of the output signal with resistance of load of 130 ohms:
– amplitude, В, not more than …10;
– duration, mks… 2 ± 0,5;
– duration of the front, mks, not more than … 0,2;
– duration of the back front, mks, not more than … 0,2.
