FEATURES
- EXCELLENT LOW-LEVEL GAMMA DETECTION
- MRSP-1 NEAR TISSUE EQUIVALENT PROBE
- 1 µR/hr – 10 mR/hr DOSE RANGE
- AUTO RANGING UNITS
- DUAL MODE CAPACITY FOR
- DOSE RATE & COUNT RATE
- AUDIBLE/VISUAL ALARMS
DSM-500 W/ MRSP-1 PROBE
Low Dose Measurements
The DSM-500 combined with the MRSP-1 PROBE allows the user to make near tissue equivalent low dose measurements. The rate meter boasts an oversized digital display with unique counts to dose capability allowing the user to quickly change between counts and dose rate and back to counts by simply flipping a toggle switch. Other features include a scaler for counts per unit of time, display error indications and audible/visual ALARMS.
DSM-500 SPECIFICATIONS
| Dose/Counts Switch | Change Dose Rate to Count Rate by Toggling an External Switch |
| Display | LCD 4-Digit x .75″ LCD w/LED Backlight |
| Probe | MRSP-1 |
| Dose Range | 1 µR/hr- 10 mR/hr (Cs137) |
| Energy Range | 40keV – 2 MeV (near tissue equivalent) |
| CPM Range | 0-999.9 Kcpm or Kcps |
| Probe Linearization | Internal adjust for calibration constant and dead time |
| Scaler Ranges | 0-999.9 Kcounts |
| Scaler Count Time Ranges | 10-2550 Seconds (10 second increments) |
| Alarms | 5-95% of Range |
| Diagnostics | Low Battery, Over-range – Audible & Visual Alarms |
| Range Adjustment | Auto-Ranging All Scales |
| Electrical Non-Linearity | < 5% Full Scale |
| Response Time | Fast – 10-2550 Seconds (adjustable) | Slow 10-250 seconds (adjustable) |
| Drift | < 5% |
| Environmental | -20°F[-28°C] to 140°F[60°C] 5-95% RH IPX4 Housing |
| High Voltage Adjustable | 400-1250 VDC | Regulation +-1% |
| Battery | 6 – “AA” Alkaline (nominal 200hrs Operation) |
| Dimensions | 6.25″(16cm) H x 4″ (10cm) W x 7″(18cm) L |
| Weight | 2.5 lbs. (1.2 Kilos) |
MRSP-1 SPECIFICATIONS
| General Use | Low Level Gamma Dose Rate Measurements |
| Detector Type | 1.5” dia x 1” Plastic Scintillator |
| CPM Range | 0-999.9Kcpm |
| Dose Range | 1 µR/hr- 10 mR/hr (Cs137) |
| Energy Response | 40keV – 2 MeV (near tissue equivalent) |
| Sensitivity (Cs137 gamma) | ≈ 100cpm/µR/hr |
| Efficiency (4π) | ≈ 2% |
| Background (10 µR/hr) | ≈ 900cpm |
| Operating Voltage | 600 – 1100 vdc |
| Dead Time | ≈ 35 µsec |
| Compatibility | All Johnson Rate Meters |
| Environmental | -20°F[-28°C] to 140°F[60°C] 5-95% RH |
| Connector | BNC (other types available) |
| Dimensions | 1.7″ (4.25cm) Dia x 6” (15cm) L |
| Weight | 4 oz (0.11 kg) |
