Fluke
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| Brand | Fluke |
|---|---|
| Origin | USA |
| Model | 451P |
| Detection Principle | Pressurized ionization chamber (300 cm³, 6 atm) |
| Radiation Types | γ-rays and X-rays ≥25 keV |
| Measurement Ranges | 0–500 μR/h to 0–5 R/h (or equivalent in Sv: 0–5 μSv/h to 0–50 mSv/h) |
| Accuracy | ±10% of reading (10–100% of full scale), calibrated with ¹³⁷Cs |
| Response Time | 1.8–4.8 s (10%–90% rise time, dependent on range and dose rate) |
| Power | Two 9 V alkaline batteries (200 h typical life) |
| Operating Environment | –20 °C to +50 °C, 0–100% RH |
| Dimensions | 10 × 20 × 15 cm (4 × 8 × 6 in) |
| Weight | 1.07 kg (2 lb 6 oz) |
| Display | Analog bar graph (100-segment, 6.4 cm) + 2.5-digit LCD with backlight |
| Interface | RS-232 for PC connectivity |
| Compliance | Designed for use in accordance with ANSI N42.17A, IEC 60846, and applicable radiation safety practices per NRC and IAEA guidance |