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Model 9DP-1

Pressurized Ion Chamber

Part Number: 48-3899

Features

Range: 2 µSv/h to 500 mSv/h (200 µR/hr to 50 R/hr)
Special Design for Measuring Pulsed Fields
Low Pressure Chamber is Non-Hazmat
Shows Exposure Rate & Either Integrated Exposure or Peak Exposure Rate
Pulsed Mode for Measuring Pulsed Radiation
Sunlight Readable Color Display
Auto-Zeroing & -Ranging
Rechargeable Batteries
Audio & Visual Alarms
Data Logging
USB Connectivity
Free Firmware Updates Through Website

The Model 9DP-1 is a digital, hand-held pressurized ion chamber that provides highly sensitive exposure measurements of gamma and x-ray radiation at energies above 25 keV and beta radiation at energies above 1 MeV. This meter is specially designed for radiography work where pulsed fields are being measured. It correctly integrates 50 ns pulses (and wider) that other systems typically miss or measure inaccurately. Another feature of this instrument is that the detector chamber is only pressurized to 2.5 atm (22 psig), thus avoiding all (USA) HAZMAT concerns for shipping and handling. However, this reduced pressure also reduces sensitivity, so the minimum “good” measurement point is 2 µSv/h (200 µR/hr).

Measurements and instrument status are displayed on a large 232K-color, backlit LCD screen. The screen displays the current exposure rate as well as simultaneously displaying either the integrated exposure rate or the peak exposure rate in Sv, R, Gy, or rem units. An additional mode, Pulsed Mode, locks the instrument in the highest measurement range in order to improve pulsed radiation response while sacrificing low radiation reading resolution.

The instrument is operated using the four push-buttons below the screen (ON/OFF, FUNCTION, AUDIO, ACK/RESET). In addition to the visual display, click audio proportional to the current exposure rate audibly indicates the exposure rate level. Two alarm levels can be set to alert the user whenever the pre-programmed level has been exceeded. Alarms are indicated on the display and by an audio tone. The instrument can also be configured for data logging. Logged data can either be stored in CSV format and written to a standard USB drive inserted in the instrument’s USB port, or written directly to a Microsoft Excel spreadsheet by connecting the instrument to a computer running Ludlum’s Model 9DP Logging Spreadsheet Software (see Options).

The Model 9DP parameter settings can be edited by connecting the instrument to a basic USB keyboard. Instrument setup and calibration can also be configured using the Ludlum Dimension Interface Kit, which includes the Dimension Configuration Manager Software and the required USB cable (see Options).

Specifications

Radiation Detected	Gamma & X-rays above 25 keV Beta above 1 MeV Correctly integrates pulsed fields with 50 ns pulse widths
Energy Response	± 25% from 60 keV to 1.25 MeV (see Graph)
Detection Range (auto-ranging)	*Sv/h units: 2 - 50 μSv/h, 2 - 500 μSv/h, 0 - 5 mSv/h, 0 - 50 mSv/h, 0 - 500 mSv/h R/h units: 0.2 - 5 mR/h, 0.2 - 50 mR/h, 0 - 500 mR/h, 0 - 5 R/h, 0 - 50 R/h Gy/h units: 2 - 50 μGy/h, 2 - 500 μGy/h, 0 - 5 mGy/h, 0 - 50 mGy/h, 0 - 500 mGy/h rem/h units:** 0.2 - 5 mrem/h, 0.2 - 50 mrem/h, 0 - 500 mrem/h, 0 - 5 rem/h, 0 - 50 rem/h * Users wanting to take measurements in Sv/h units should see the Model 9DP-1* which is specifically designed to measure ambient equivalent dose.
Measurement Readouts	Simultaneous display of rate and either the integrated value, highest (peak) rate, or pulsed mode status
Drift	Less than 0.3 µSv/h (30 µR/hr, 0.3 µGy/h, 30 µrem/h)
Chamber Volume	220 cm³ volume pressurized to 2.5 atm (22 psig)
Chamber Density	Chamber wall density is 601.7 mg/cm², Can wall density is 332.5 mg/cm². Total density of chamber + can is 934.2 mg/cm².
Accuracy	± 10%
Response Time	Ranges from 7 seconds in lowest range to under 2 seconds in highest range when measuring from 10% to 90% of final value
Display	LCD with 8.9 cm (3.5 in.) diagonal, 240 H x 320 W pixels, TFT active matrix, 232K colors, 220 cd/m², automatic sensor-controlled backlighting
User Controls	4 pushbuttons: ON/OFF FUNCTION (for peak rate, integrate, or pulsed modes) AUDIO (on/off, volume) ACK/RESET (for alarm acknowledgement, meter reset, and clearing integrated dose or peak rate)
Automatic Functions	Auto-ranging, Auto-zeroing, Auto LCD backlighting
Alarms	Two levels of radiation alarms available, each is user programmable throughout entire readout range.
Data Logging	Data is stored to detachable USB drive in CSV format for easy retrieval by PC spreadsheet/database programs. Data points include date and time, rate, integrated reading, and instrument status. Logging time intervals are set by PC interface program or USB keyboard (see Options).
Audio Outputs	Built-in unimorph speaker, > 60 dB at 0.6 meters (2 ft.). Optional audio jack available for connection to an external headset. (see Options)
USB Interface	Single USB 2.0 port. May be connected to: A USB keyboard (with no additional USB ports, and no integrated mouse or trackpad or audio controls) to facilitate password-protected parameter changes A USB memory storage device for storing logged data A PC with the optional Dimension Interface Kit for parameter editing and calibration (see Options)
Warm Up Time	< 1 minute when the instrument is in temperature equilibrium with the surrounding environment
Temperature Range	-20 to 40 °C (-4 to 104 °F)
Humidity	0 - 95%, non-condensing
Geotropism	less than 1%
Power	Eight rechargeable "AA" NiMH batteries, supplied with wall charger for direct connection to instrument
Battery Life	Approximately 12 to 30 hours between charges depending on backlighting and USB usage
Construction	Durable molded plastic with internal metal support
Size (H x W x L)	21.9 x 11.6 x 24.5 cm (8.6 x 4.6 x 9.6 in.)
Weight	1.5 kg (3.3 lb), including batteries

Options

Option	Description	Part Number
Dimension Interface Kit	Enables calibration and setup of Dimension instruments. Includes Dimension Configuration Manager software and USB cable.	4293-763
Model 9DP Logging Spreadsheet Software	Allows user to log real-time data from the instrument directly to an Excel spreadsheet.	Software + USB Cable: 4293-998 Software Only: 1370-101
Headphone Jack	Adds headphone jack to instrument.	4293-891
Stereo/Mono Headphones	Adjustable stereo/mono headphones.	22-9313
Model 9DP Series Rechargeable Battery Pack	Battery pack of 8 rechargeable "AA" NiMH batteries.	4536-101
Model 9DP-Series Alkaline Battery Pack	Battery pack of 8 non-rechargeable "AA" batteries, permitting quick battery change in the field.	4543-028
Plastic Disk Check Sources	10 µCi ¹³⁷Cs check source	01-5231
Transport & Storage Case - Medium	Rugged, dust- and waterproof transport and storage case.	2311063
Shoulder Strap	1.8 m (6 ft) adjustable nylon shoulder strap. Requires instrument case modification.	4536-632
USB Keyboard	Connects to instrument and can be used to configure the instrument for data logging.	2312289