Alfarad Plus - ARP
This version includes a complete set of measurement units and sampling devices.
It comprises two measurement units—one for measuring the equilibrium equivalent radon concentration (EERC) and one for measuring radon concentration—housed within a single enclosure.
This version also includes a standalone air pump with sampling attachments, designed for collecting samples to measure radon content in water and soil gas, as well as for determining the radon flux density (RFD) from the ground surface. EEC (Equilibrium Equivalent Concentration) Measurement Unit
Measurement range for radon EEC: 1 to 1.0×10⁶ Bq·m⁻³
Measurement range for thoron EEC: 0.5 to 1.0×10⁴ Bq·m⁻³
Limit of permissible intrinsic relative error: ± 30%
Intrinsic background level of the EEC measurement unit: ≤ 0.002 s⁻¹
Volumetric air flow rate through the filter: 10.0 ± 0.5 L/min
AC (Activity Concentration) Measurement Unit
Measurement range for radon-222 AC in air: 1 to 2.0×10⁶ Bq·m⁻³
Measurement range for ²¹⁶Po (ThA): 1×10⁻³ to 1×10² counts/s
Limit of permissible intrinsic relative error for air samples: ± 20%
Volumetric flow rate of the micro-blower: (1.0 ± 0.2) L/min
Intrinsic background level of the AC measurement unit: ≤ 0.3 Bq·m⁻³
Measurement range for radon-222 AC in water samples: 6 to 800 Bq·L⁻³
Limit of permissible relative error for radon-222 AC measurements in water: ± 30%
Measurement range for radon flux density from the soil surface: 20 to 10³ mBq/(s·m²)
Limit of permissible relative error for radon-222 flux density measurements from the soil surface: ± 30%
Measurement range for radon-222 AC (with preliminary air sampling into collection vessels): 20 to 10⁷ Bq·m⁻³
Limit of permissible... Relative error for Radon-222 activity concentration (AC) measurements involving preliminary air sampling into collection containers: ± 30%
Measurement range for Radon-222 activity concentration in soil-gas samples: 10³ to 10⁶ Bq·m⁻³
Maximum permissible relative error for Radon-222 activity concentration measurements in soil gas: ± 30%
General technical specifications for EERC (Equilibrium Equivalent Radon Concentration) and AC (Activity Concentration) measurement units
Temperature display range: 0 to 50°C
Relative humidity display range: 10 to 95%
Atmospheric pressure display range: 700 to 820 mmHg
Power consumption (from battery): 8.0 W
Warm-up time (to reach operating mode): 1 min
Continuous operation time (without recharging): 6 h
Mean time between failures (MTBF): at least 2000 h
Overall dimensions
"Alfarad Plus - AR" model: 220 × 200 × 165 mm
"Alfarad Plus - A" and "Alfarad Plus - R" models: 220 × 200 × 120 mm
Weight (including batteries)
"Alfarad Plus - AR" model: 3.6 kg
"Alfarad Plus - A" and "Alfarad Plus - R" models: 2.7 kg
Technical specifications for the autonomous air sampler (blower)
Volumetric air flow rate: 1.0 ± 0.2 L/min
Overall dimensions of the autonomous air sampler (L × W × H): 150 × 80 × 50 mm
Weight of the autonomous air sampler (including batteries): 0.4 kg