Detective and Detective-100
HPGe-Based Portable Nuclide Identifier

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; 5 speed settings.

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 overrange indication and continuous audible alarm at dose rates >10,000 µSv/hr.

DETECTORS

Internal HPGe Detector
Detective Crystal Nominal Dimensions: 50 mm diameter x 30 mm deep.
Detective-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. Detective switches between the two automatically: Dose rate uncertainty ≤50% to +100%; continuous audible alarm at dose rates >10,000 µSv/h.

DIGITAL MCA AND DATA PROCESSOR

Display: 240 x 160 pixel backlit LCD.

Keypad: 21 numeric and function keys. Dedicated large single key for initiation of ID, Search and MCA display modes.

• Simple to use menu operation

• Digital MCA with internal storage of multiple spectral data

• Maximum number of stored spectra >40.

• 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

Instrument is supplied factory pre-calibrated and adjusted. A recalibration function allows correct performance to be verified and adjusted using a small ¹³⁷Cs source.

DETECTIVE DISPLAYS AND MENUS

Main Screen

Gamma Count Rate Bar Graph 20 kcps full scale. Should the count rate exceed 20 kcps, bar is completely black and the rate line flashes.

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

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

Pressing Search starts a search mode acquisition

Pressing ID starts an identify operation

Pressing Backlight turns the light on or off

Pressing Display brings up the spectral display

Pressing Menu brings up the Main Menu

Search
Search starts when the "Search" button is pressed on the keypad. In search mode, a "strip chart" is drawn across the screen showing count rate vs. time on a log scale. 5 speed settings are available. If dose rate is beyond the maximum, the bar is black and flashes. The data may be saved.

Identify
When ID is pressed, data is cleared and acquisition starts.

Nuclides are divided into 5 basic types (Nuclear, Industrial, Medical, Natural, and Other).

Pressing Menu goes to the following options:
1 -  View Found Nuclides returns confirmed identified nuclides
2 -  View Suspected Nuclides
3 -  View Top Lines returns the "Top 10 List"
4 -  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.

Main Menu
1 - Administration Menu
2 - Calibrate
3 - Audio Settings
4 - View Diagnostic Status

            1 - Administration Menu
Password Protected. Once verified, the spectrum screen is shown. Spectrum may be manipulated with Arrow keys and via zoom and jump "hot keys".

The Administration Menu has the following items:
1 - View Status
2 - General Settings
3 - Change Clicker Sensitivity
4 - Store & Retrieve Spectra
5 - Cooler Settings
6 - Search Mode Settings
7 - Change Dose Units
8 - Auto-Calibration Setup
9 - Exit Administrator Mode

            2 - Calibrate
Calibrate looks for the ¹³⁷Cs peak in a range of 650 keV–680 keV. Once the peak is located, and there are at least 1000 counts in the peak (net area), a new fine gain is calculated. This is executed automatically when on the docking station.

            3 - Audio Settings
Allows setting various parameters associated with the speaker and headphone.

            4 - View Diagnostic Status
Reports instrument status, for example:
+12V                     OK
–12V                     OK
+3.3V                    OK
Detector Temp
    Body Temp        OK
    Cold Tip Temp   OK
Cooler Drive          OK
HV Volt                  OK

PHYSICAL SPECIFICATIONS

Detective

Maximum Overall Dimensions (including handle, Ge detector endcap and shock absorbers): 37.3 cm L x 16 cm W x 32 cm H  (14.7" L x 6.3" W x 12.6" H)
Weight: 22.9 lb (10.39 kg)

Detective-100

Maximum Overall Dimensions (including handle, Ge detector endcap and shock absorbers):    39.4 cm L x 16.3 cm W x 32 cm H   (15.5" L x 6.55" W x 12.6" H)
Weight: 23.3 lb (10.65 kg)

Internal Battery Life:  >3 hours at 25°C with a cold detector on fully charged internal battery; battery lifetime may be extended indefinitely by the use of external battery packs which are available in "battery belt" formats. The unit is expected to be kept running once cold.

Input Power: 10–17 V dc 30 Watt or via auto-sensing Mains powered Battery Charger.

Temperature Operation Range/Humidity:  –15°C to +50°C, Relative Humidity <90% at 35°C, non-condensing.

Communications Ports
USB 1.1 connection provided at the rear panel, protected by dust cover.
External Power and DC in.

Cool Down Time: The high reliability cooler is designed for continuous operation. Initial cool down and holding ready for use is normally achieved by attachment to the supplied docking station, which may be powered from DC or Mains, and both holds and charges the internal battery. 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.

ORDERING INFORMATION

Note on Calibration Check Source
The calibration check source is internal to the docking station. It comprises a solid, sealed, ~0.25-µCi (9250-Bq) ¹³⁷Cs calibration source housed in the source holder on the front of the docking station. This source is exempt under U.S. and European regulations and is only supplied pre-installed by ORTEC (not separately). It is not recommended that it be removed, and ORTEC will not accept any responsibility for its removal. If this source is NOT required with the instrument because of local issues, this must be stated at time of order. THE SOURCE CANNOT BE SUPPLIED SEPARATE FROM THE DOCKING STATION.

Options
A separate data sheet covering Detective Options and accessories is available on request.

Software for Detective and Detective-100
Detective/Detective-100 is 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.

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.