Model 451P Ion Chamber: Dose & Dose Rate
The Fluke Model 451P Ion Chamber is used in a wide range of medical and health physics applications. The Model 451P Ion Chamber was designed to measure leakage and scatter around diagnostic X-ray and radiation therapy suites. Also, the Model 451P is ideal for site surveys and is regularly used by X-ray manufacturers, radiation therapy, government agencies, state inspectors, research labs, biomedical technicians, and in airports for baggage inspection equipment maintenance. This Ion Chamber was manufactured by Victoreen which was owned by Inovsion, Cardinal Health, Syncor, and presently Fluke Biomedical.
- High sensitivity µR measurements of exposure and exposure rate
- Available with dose equivalent energy response (SI units)
- Fast response to measure radiation from leakage, scatter beams and pinholes
- Ergonomic, anti-fatigue handle with replaceable grip and wrist strap
- Excel add-in for Windows ® for data logging and selection of instrument operating parameters (optional)
- Low noise chamber bias supply for fast background reading
- Choice of bright, highly visible colors
- Easy touch keys
- Click here for specifications.
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| DS 451P Ion Chamber | |
| DS 451P Ion Chamber (Sv) | |
| 451 XL Software and Cable |
Waterproof Pelican Cases Available
For questions or to order, call 888 368 9118, 310 589 0601 or email: sales@drct.com
Model 451P
Ion Chamber (Pressurized) SPECIFICATIONSRadiation Detected
Beta above 1 MeV, Gamma and X-rays above 25 keV
451P Operating Ranges
| 0-500 µR/h or 0-5 µSv/h |
| 0-5 mR/h or 0-50 µSv/h |
| 0-50 mR/h or 0-500 µSv/h |
| 0-500 mR/h or 0-5 mSv/h |
| 0-5 R/h or 0-50 mSv/h |
Accuracy
Within 10% of reading between 10% and 100% of full scale indication on any range, exclusive of energy response. Calibration source is 137 CsDetector
Chamber: 300 cc volume pressurized air ionization chamber to 6 atmospheresControls
ON/OFF and MODEAutomatic Features
Auto-zeroing, auto-ranging, and auto-backlight451P Response Time
Analog response time from 10% to 90% of reading for a full scale step increase is dependent on operating range. Response time for a step increase in radiation exposure rate from background:
|
Step increase, Step increase, background to |
Time to reach 90% of final value (seconds) |
| 400 µR/h | 4.8 |
| 4 mR/h | 3.3 |
| 10 mR/h | 4.3 |
| 40 mR/h | 4.5 |
| 100 mR/h | 2.7 |
| 1 R/h | 2 |
| 4 R/h | 2.7 |
The following table shows time measured from 10% to 90% of final value for a step increase or decrease in exposure rate such that a range change does not occur. These values are the response times for the various ranges:
| Range 10% - 90% | (seconds) |
| 0-500 µR/h (5 µSv/h) | 5 |
| 0-5 mR/h (50 µSv/h) | 2 |
| 0-50 mR/h (500 µSv/h) | 1.8 |
| 0-500 mR/h (5 mSv/h) | 1.8 |
| 0-5 R/h (50 mSv/h) | 1.8 |
Power
Two 9-volt alkaline, 200 hours operationDisplay
LCD analog/digital with backlightAnalog
100 element bar graph 2.5 in (6.4 cm) long. Bar graph is divided into five major segments, each labeled with the appropriate value for the range of the instrumentDigital 2 1/2 digit display zero digit depending on the operating range of the instrument. The units of measurement are indicated on the display at all times. Digits are 1/4 in (6.4 mm) high. Low battery and freeze indicators are also provided on the display
Warm-Up Time
Less th an two minutes for initial operation when the instrument is in equilibrium with ambient temperatureEnvironmental
Temperature Range
- 20°C to + 50°CRelative Humidity
0 to 100%Geotropism
NegligibleTypical Energy Dependence
Nitrogen gamma rays are 110% to 120% of indicated readings as determined at the University of LowellDimensions
4 in (w) x 8 in (d) x 6 in (h) (10 x 20 x 15 cm)
Weight
2 lb 6 oz (1.07 kg)451P Models
Model 451P-RYR 451P w/standard ion chamber
Model 451P-YGG 451P w/standard ion chamber
Model 451P-DE-SI-RYR 451P w/Dose Equivalent ion chamber
Model 451P-DE-SI-YGG 451P w/Dose Equivalent ion chamber
Options
Model 451EXL Excel add-in for Windows ® and RS-232 interface cableModel 190HPS Single Unit Carrying Case
Model 190HPC Multiple Unit Carrying Case
Model 62-103 137 Cs 10 µCi Check Source
Modes
Integrate mode operates continuously 30 seconds after the instrument has been turned on. Integration is performed even if the instrument is displaying in mR/h or R/hFreeze mode will place a tick mark on the bar graph display to hold on the peak displayed value. The unit will continue to read and display current radiation values