DA-328 Neutron Dose Survey Meter

Product Overview

The DA-328 Neutron Dose Survey Meter utilizes a highly sensitive ³He tube detector, offering exceptional neutron measurement sensitivity, superior gamma suppression, compact design, lightweight construction, and intelligent, user-friendly operation. This instrument is ideal for neutron radiation detection in environmental protection, chemical industry, petroleum, medical facilities, import/export commodity inspection, accelerators, neutron sources, security screening, border control, and customs inspection applications.

This intelligent radiation measurement instrument features a smart probe that connects to a multi-functional radiation measurement host unit. It expands the range of smart probes available and enhances the application scope of multi-functional radiation measurement systems. Using a unified inspection software platform and single multi-functional host, the instrument achieves product modularization, allowing customers to meet diverse operational requirements by selecting different probes.

The probe employs a ³He proportional counter tube paired with a polyethylene moderator to measure neutron dose rates. It is widely used for neutron dose rate detection in nuclear power plants, nuclear propulsion systems, research reactors, particle accelerators, and neutron source facilities. It is also applicable for environmental protection bureaus, disease control centers, and oil well logging operations.

Compliant Standards: GB/T 14318-2019 / IEC 61005:2014 — Radiation protection instrumentation — Neutron ambient dose equivalent (rate) meters.

Applications

Radiation protection for nuclear facilities, nuclear regulatory bodies, and enterprises/institutions handling radioactive sources
Neutron detection in petroleum exploration
Mineral prospecting operations
Official duties performed by environmental monitoring agencies and emergency response operations by disease control and public health departments
Security readiness for major events and diplomatic missions/consulates abroad
Nuclear and radiation counter-terrorism including inspection and quarantine, customs, port authorities, and border control agencies aimed at preventing illicit transport of radioactive materials and radioactive terrorist attacks
Third-party testing and inspection agencies

Main Features

Utilizes highly sensitive, imported detector with rapid response times and ease of operation
High sensitivity, excellent resistance to gamma radiation, and superior energy response characteristics
Functions effectively as both portable device and fixed-position neutron dose monitor
Supports connection of various specialized radiation dosimetry probes and can be linked to host computer with dedicated analysis software for professional data analysis
Independent measurement channels and alarm indicators for both gamma radiation and neutrons
Continuously adjustable alarm thresholds with audible and visual alert signals

Technical Specifications

Parameter	Specification
Detector	³He Proportional Counter Tube + Polyethylene Moderator (Spherical)
Sensor Pressure	8 times atmospheric pressure
Measurement Type	Neutrons (n)
Display	3.2-inch Color LCD; Resolution: 320×240; with Backlight
Sensitivity	2.83 cps/(μSv/h) (using a ²⁵²Cf source)
Real-time Dose Equivalent Rate	0.01 μSv/h - 99.99 mSv/h
Accumulated Dose	0.01 μSv - 9999 mSv
Energy Range	0.025 eV - 15 MeV
Relative Intrinsic Error	≤ ±15%
Repeatability	≤ 10%
Detection Efficiency	Approximately 90% for thermal neutrons
Gamma Suppression Ratio	≥ 100:1 (at 10 mSv/h, using ¹³⁷Cs)
Radiation Resistance	Operates normally with accumulated gamma dose up to 300 Sv
Alarm Modes	Audible and visual alarms
Alarm Thresholds	Continuously adjustable within measurement range
Alarm Categories	Threshold, Overload, Fault, Low Battery Voltage
Display Units	nSv/h, nGy/h, μSv/h, μGy/h, cps, etc.
Data Storage	Stores up to 20,000 data records
Angular Response	4π angular response deviation less than ±10%
Corrosion Resistance	Resistant to weak acids, weak bases, and salt solutions; insoluble in most solvents below 60°C
Communication Interface	RS-485
Power Supply	Powered by host device with built-in rechargeable lithium battery
Power Consumption	Total power consumption ≤ 200 mW (excluding display backlight)
Operating Time	Over 24 hours continuous operation with host device (buzzer and backlight disabled)

Environmental Characteristics

Parameter	Specification
Operating Temperature	-41°C to +50°C (Compliant with GJB 150.3A-2009 and GJB 150.4A-2009)
Storage Temperature	-41°C to +50°C (Compliant with GJB 150.3A-2009 and GJB 150.4A-2009)
Relative Humidity	≤90% at 35°C (Compliant with GJB 150.9A-2009)
Electromagnetic Compatibility	Compliant with GJB 151B-2013 (RE102, RS103, CS112, RS101)
Rain Resistance	Compliant with GJB 150.8A-2009
Vibration	Compliant with GJB 150.16A-2009
Shock	Compliant with GJB 150.18A-2009
Protection Class (IP Rating)	IP65

Mechanical Characteristics

Parameter	Specification
Diffuser Material	Low-density polyethylene
Diffuser Density	0.95 g/cm³
Dimensions	Φ230 × 360 mm (Probe); 170 × 80 × 30 mm (Main Unit)
Weight	9.5 kg (Complete Unit)