Detective-EX and Detective-DX
HPGe-based Hand-Held Radioisotope Identifiers

Specifications

OPERATION MODES

SEARCH  Scanning mode for location of radioactive sources, with audio alert using an external ear piece. Both neutron and gamma search is simultaneous; speed settings 0.1 to 50 seconds/point.

SNM Search Mode™  Nuclide-specific search mode for ²³⁵U, ²³⁹Pu and neutron counts. ¹³³Ba surrogate detection may be turned on for training purposes. Bar graph display of nuclide confidence level. Aid to Identify mode.

IDENTIFY Gamma*  Proprietary scheme for identification and classification of radionuclides as:
            Industrial: Including ⁵⁷Co, ⁶⁰Co, ¹³³Ba, ¹³⁷Cs, ¹⁹²Ir, ²⁴¹Am, ⁷⁵Se
            Medical: Including ¹⁸F, ⁶⁷Ga, ^99mTc, ¹¹¹In, ¹²³I, ¹³¹I, ¹³³Xe, ²⁰¹Tl
            Natural (NORM): Including ⁴⁰K, ²²⁶Ra, ²³²Th, ²³⁸U
            Nuclear: Including ²³³U, ²³⁵U, ²³⁷Np, ²³⁹Pu, ²⁵²Cf

These classifications are based on an internal, fixed library according to ANSI N42.34. Customized libraries for specific applications can be supplied by special order.

Dose Rate  Visual over range indication and continuous audible alarm, user settable. Over-ride alarm at dose rates >10,000 µSv/hr.

DETECTORS

Internal HPGe Detector

• Detective-EX/-DX Crystal Nominal Dimensions: 50 mm diameter x 30 mm deep.

• Detective-EX/-DX-100 Crystal Nominal Dimensions: 65 mm diameter x 50 mm deep.

• P-type high-purity germanium. Coaxial construction.

• Cooler: Hymatic SAX101-002 high reliability, low power Stirling Cooler. Cooler design life >5 years continuous running. Dual piston design, 1 W nominal lift at 100°K.

• Digital Noise Suppression: "LFR Filter," ORTEC Patent Pending.

Gamma Dose Rate Detector  Two detectors determine the gamma dose rate over a wide range from <0.05 µSv/h to >10000 µSv/h, a dose-rate range of around six decades. For low dose rates, below ~20 µSv/h, the dose rate is determined from the Ge detector spectrum. For dose rates above this value, the internal compensated GM tube is used. Instrument switches between the two automatically.

Dose rate uncertainty ≤50% to +100%; continuous audible alarm at dose rates >10,000 µSv/h (fixed maximum threshold), user settable threshold below this.

Neutron Detector Module  4 each 3He tubes: 4" active length, 0.5" diameter, 20 atm ³He fill pressure. High Density Polyethylene moderator.  

DIGITAL MCA AND DATA PROCESSOR

Display  3.5” VGA 640 x 480 touch-sensitive, operate with finger or stylus.

Data Processor Intel® PXA270 processor 520 MHz Intel Xscale

Control Interface  Large single key for initiation of ID, Search and MCA display modes on touch sensitive screen.

• Simple to use menu operation

• Digital MCA with internal storage of multiple spectral data

• Maximum number of stored spectra >40; unlimited on removable media.

• 8k channel conversion gain

• Monitoring of vital system functions:
                                      Instrument Battery life remaining
                                      System DC voltages
                                      Detector Bias for both HPGe and GM
                                      HPGe Crystal Temperature
                                      Spectrum Storage Space

Instrument is supplied factory precalibrated and adjusted. A recalibration function allows correct performance to be verified and adjusted using a small radioactive source.

DISPLAYS AND MENUS

Main Screen

Gamma Count Rate Bar Graph  20 kcps full scale.

Dose Rate Bar Graph  10 mSv/hr full scale, flashes on over range.

Status Lines:
            WARNING!! High Dose Rate — Displayed when Dose rate exceeds 10 mSv/hr.
            Detector is Warm — Displayed when crystal temperature is above working limit.
            Bias Supply Error — Displayed if any power supply is bad.
            WARNING!! Low Battery.

Search Mode (Gamma/Neutron)  Dwell times 0.1 – 50 seconds per point. Over-range warning.

SNM Search Mode™  Nuclide-specific search mode for ²³⁵U and ²³⁹Pu. Bar graph display of nuclide confidence level.

Identify  Nuclide ID and calssification.

"Intense"  shows the most intense lines list, which is a continuously updating list of the 12 best peaks currently detected. The nuclides and energies are based on the internal nuclide library. The rank is based on the confidence value for the peak.

"Save"  Saves the spectrum.

"Display"  brings up the spectral display. The spectrum may be manipulated via the arrow keys and various accelerator keys for cursor movement. Energy and channel contents are displayed with the spectrum.

Advanced Setup  Password protected.

Calibration Check  Manual or Automatic Calibration Check. Automatic may be triggered by interval or time of day. Instrument is supplied calibrated from factory.

View Data Acquisition Parameters  Reports instrument status.

PHYSICAL SPECIFICATIONS

Maximum Overall Dimensions (including handle, Ge detector end cap and shock absorbers)
Detective-EX             37.3 cm L x 18.3 cm W x 34.3 cm H    (14.7" L x 7.2" W x 13.5" H)
Detective-EX-100      39.4 cm L x 18.3 cm W x 34.9 cm H    (15.5" L x 7.2" W x 13.75" H)
Detective-DX             37.3 cm L x 16 cm W x 34.3 cm H       (14.7" L x 6.3" W x 13.5" H)
Detective-DX-100      39.4 cm L x 16.3 cm W x 34.9 cm H    (15.5" L x 6.55" W x 13.75" H)

Weight
Detective-EX             25.9 lb (11.75 kg)
Detective-EX-100      26.3 lb (12 kg)
-DX versions are 1.9 lb (0.9 kg) lighter.

Internal Battery Life  >3 hours at 25°C when HPGe detector is cold. Battery lifetime may be extended indefinitely by the use of external battery packs which are available in "battery belt" formats.

Input Power  10 to 17 V DC 30 W or from battery or auto-sensing Mains powered Battery Charger.

External Power  DC In and battery Charge In. MS3112E12-10-s or Bendix PT02E-12-10S connector.

Temperature
Operation Range:  0°C to 40°C
Relative Humidity:  <90% at 35°C, non-condensing

Communications Ports

External Connectivity to the system:

• 1 SD (Secure Digital) card slot (3.3 V)

• 1 USB connection for "ActiveSync" capability from the PDA to an external computer (ActiveSync and remote display software included).

• 1 USB connection for control of the MCA board from an external computer

• 1 Audio headphone jack

• 1 External power connector for docking station power

Cool Down 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 high capacity device. The cooler life is expected to exceed 50,000 hours continuous operation. Initial cool down time depends on ambient temperature, but is typically <12 hours at 25°C.

Communication Software

The Detective-EX/-DX is a member of the ORTEC CONNECTIONS family. Remote control and individual spectrum download, even over a network, is achieved simply, by the use of ORTEC CONNECTIONS products such as MAESTRO-32 MCA Emulation software.

Multiple spectra may be block-transferred from the instrument controller to external PCs by industry standard means.

Software for Detective-EX/-DX and Detective-EX-100/-DX-100

Detective-EX/-DX and Detective-EX-100/-DX-100 are fully supported by the latest versions of the highly successful MAESTRO-32 MCA Emulator as well as the well-known ORTEC Gamma Spectroscopy Packages such as GammaVision-32 for generalized HPGe spectrum analysis, PC/FRAM and MGAHI for Pu and U isotopic ratio analysis and ISOPlus for in-situ waste assay analysis.

The integral USB connection in the instrument hardware provides full PC control, real-time live MCA display, fast data transfer of single and multiple spectra to the PC, and full ORTEC CONNECTIONS network support. Separate brochures are available on request.

PLEASE NOTE: MAESTRO-32 (A65-B32) is supplied as part of packages containing "PKG" in the model number, or it can be purchased separately at a later date.

ORDERING INFORMATION