Bertin Technologies ALPHAGUARD DF2000 - 12.3 Basic Functions AlphaGUARD DF2000

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USER MANUAL
Basic functions AlphaGUARD DF2000
Type of radon detector
Ionization chamber, HV | 750 VDC
Mode of operation
3D-alpha spectroscopy a n d current mode
Total detector volume
0,62 liter (38 cubic inches)
Active detector volume
0,56 liter (34 cubic inches)
Type of Radon progeny filter
(detector entry window)
Fine dust
filter (retention coefficient >99,9 %)
Detector filling mechanism
Design-optimized for fast passive diffusion
Transient response function
(time delay)
Signal > 30 % after 10 min
Signal > 70 % after 20 min
Signal > 90 % after 30 min
Detector signal acquisition
Fast digital signal sampling network, using
three separate ADC channels
Spectral signal extraction
DSP (Digital Signal Processing), on-line-cross
correlation algorithms
Detector efficiency in Radon
measurement mode
1 CPM at 20 Bq/m³ (0,55 pCi/l)
Detector efficiency in Rn/Tn
discrimination mode
- for radon
- for thoron at 1l/min flow rate
- for thoron at 2l/min flow rate
1 CPM at 60 Bq/m³ (1,6 pCi/l)
1 CPM at 200 Bq/m³ (5,5 pCi/l)
1 CPM at 140 Bq/m³ (3,8 pCi/l)
Background due to internal
detector contamination
< 1 Bq/m³ (0.03 pCi/l)
Measurement range Radon
(Rn-222)
2 Bq/m³ … 2 000 000 Bq/m³
(0.05 pCi/l … 54 000 pCi/l)
Measurement range Thoron
(Rn-220)
2 Bq/m³ … 2 000 000 Bq/m³
(0.05 pCi/l … 54 000 pCi/l)
Resolution on display
1 Bq/m³ (0.01 pCi/l)
Fold back protection
> 10.000.000 Bq/m³ (> 300 000 pCi/l) verified
System linearity error
< 3% within total range
Instrument calibration error
(Rn-222)
r
3 % (plus uncertainty of the primary
standard)