Model 9DP-1 ion chamber

Ludlum Measurements

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A portable digital pressurized ionization chamber

The 9DP-1 model: portable, sensitive to gamma, X and beta radiation, perfectly integrating 50 ns pulses (and more).

Advantages

Special design for pulsed field measurement
Measurement of gamma and X rays (energies > 25 keV) and beta rays (energies > 1 MeV).
Specially designed for radiology applications involving pulsed fields.

Description

Specification

Applications

Resources

The Model 9DP-1* is a portable digital pressurised ion chamber designed to provide highly sensitive exposure measurements of gamma and X-ray radiation at energies above 25 keV, as well as beta radiation at energies above 1 MeV. Specially adapted to radiography work with pulsed fields, this device perfectly integrates pulses of 50 ns (and more) that other systems can miss or measure inaccurately.

The 9DP-1* is highly ergonomic and very easy to use. Its manual is clear and comprehensive, providing the user with all the information needed to use the device perfectly and make the most of its measurements.

A distinctive feature of this meter is that its sensing chamber is pressurised to just 2.5 atm (22 psig), eliminating all the problems associated with hazardous materials (HAZMAT, USA) during shipping and handling. However, this reduced pressure slightly reduces sensitivity, ensuring a ‘good’ minimum measurement point from 2 µSv/h.

Its large, backlit LCD screen makes it easy to view measurements and instrument status. The display shows the current exposure rate in real time, as well as the integrated exposure rate or the maximum exposure rate simultaneously, expressed in Sv or Gy units. In addition, its pulsed mode locks the instrument into the highest measurement range, improving response time.

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
Audio Outputs	Built-in unimorph speaker, > 60 dB at 0.6 meters (2 ft.). Optional audio jack available for connection to an external headset.
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.
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