- The personal dosimeter MyRIAM determines the inhalation dose obtained from the exposure to long-living Alpha and Beta nuclides (LLRD) in the breathing air. The aerosols will be accumulated on the surface of a membrane filter by an internal pump. The collected activity is analysed by a semiconductor detector with subsequent Alpha spectroscopy and Beta gross counting. The influence of natural occurring Radon daughters is fully compensated
- An accurate determination of the obtained dose without any additional equipment is possible by a special filter analysis mode. The small filter paper (17.5 mm diameter) can be archived and used for preservation of evidence.
- The lightweight (300 g) instrument can be worn on the body without impairment of the mobility. Sampling head, battery and electronics have been integrated into a rugged metal enclosure of the size of a mobile phone. No additional cables and hoses are required
Thông số kỹ thuật
- Power Supply : Internal batteries for approx. 24 hours operation, recharge time approx. 1 hour
- Operation : 1 Button (with lock function); Display (3 x 12 characters) with back-light
- Alarm function : optical (red bright LED at the top of the detector head) acoustical (sounder 85 dB at 2,3 kHz)
- Dimensions/Weight : 138 mm x 57 mm x 32 mm / 300g
- Interface : Infrared (reader unit for PC, connection via USB)
- Memory : 240 Data records and Alpha spectrum
- Integration Interval : 1 ... 255 Minutes (one Minute steps)
- Detector : 150 mm² ion-implanted silicon detector
- Pump : 0.25 L/min membrane type
- Filter : 3 µm PTFE, operable > 1 Month at „normal“ dust exposure
- Alpha Spectroscopy : 2.8 ... 10 MeV
- Energy Window for LLRD Alpha radiation : 2.8 ... 5.5 MeV
- Lower Beta Cut Off : 200 keV
- Maximum count rate : 100 000 counts per Minute
- Detection Limits/Thresholds : refer following text
- Software : Instrument set-up, data download, graphic display of acquired data (exposure, dose, concentration), ASCII Export (EXCEL compatible text file)