105
SPECIFICATIONS AND CARE
See also Section 2.9 for additional information on the Detective X’s batteries and cryocooler.
B.1
DETECTORS
Nuclide Identification
P-type, high-purity germanium (HPGe) crystal with coaxial construction. Crystal
nominal dimensions 65 mm diameter × 50 mm length.
Cryostat and Cooler
Hardened cryostat, with high-reliability, low-power Stirling cooler. The cryostat design
is such that the Detective X can be switched off at any time, and power subsequently reapplied, without
having to wait for a full thermal cycle (i.e., full warm-up before cooldown). This feature greatly increases
system availability during measurement campaigns.
Cooldown Time
The high-reliability cooler is designed for continuous operation. Between making
measurements, the unit is powered from a DC supply, car battery, or other device. Initial cooldown time
depends on ambient temperature, but is typically 8 hours at 25°C.
Gamma Dose Rate Detector
Three detectors determine the gamma dose rate over a wide range from
<0.05
mR/h to >100 R/h, a dose-rate range of over 6 decades. Instrument switches between the three
automatically.
Neutron Detector Module
The optional neutron detector is a large volume-segmented lithium-6
fluoride/zinc sulfate (Li6F/ZnS) detector that is ANSI N42.34 2015 compliant.
B.2
HARDWARE
Digital MCA and Data Processor
Display
4.3-in. WQVGA (480 × 272 pixels), sunlight-readable, touch-sensitive; operate with finger or
stylus
Data Processor
FREESCALE I.MX535 operating at 1 GHz
Data Storage
Media
To internal memory; or removable, low-profile USB flash drive. The unit is shipped with an
8 GB flash drive, which holds over 50,000 spectra
File Format
ANSI N42.42
Computer Interfacing
USB and Ethernet TCP/IP v4 connections via standard RJ45 Ethernet connection
(10/100Base-T — 10/100Mbps, autosensing). Ready for use with MFK (Mobile Field Kit for DoD users), ORTEC
GammaVision, iOS devices, and Android devices. WiFi (802.11) communication software. Wireless Mobile
MCB Server software.
Wireless Connectivity
IEEE 802.11b wireless and Bluetooth
GPS
The instrument is equipped with an internal GPS. The location information associated with a
measurement is optionally stored in the N42 files.
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