Portable radon monitor PRM 145
PRM 145 is a computerised instrument for monitoring the total alpha activity of radon 222Rn and its short-life products 218Po and 214Po.
PRM 145 is a computerised instrument for monitoring the total alpha activity of radon 222Rn and its short-life products 218Po and 214Po. As soon as alpha particle, generated by the radioactive decay of radon or one of it’s products, hits the ZnS layer on the wall of the scintillation cell, a photon of visible light with the wavelength of approx. 600nm is emitted. Integrated photomultiplyer tube transforms light pulses into electric signals, which are further counted by the instrument (in fixed time or to the fixed count). PRM 145 calculates the concentration of radon in the sample (together with the uncertainty of the measurement), displays the results, and stores them in the data buffer.
PRM 145 has built-in library with all parameters of scintillation cells. It is possible to transfer data between different PRM 145 instruments, or between PRM 145 and external computer. Built-in printer port enables direct printout of data to the connected printer. PRM 145 is equipped with the real-time clock, so all measurements are labelled with a time-stamp.
PRM 145 consists of two parts, both stored in a portable case. Cylindrical part contains the photomultiplyer tube, high voltage power supply, signal conditioning, and container for the scintillation cell. Processor part contains microprocessor, battery, and interfaces. On the front plate, there are keyboard, on/off switches, optical indicator for the closed container, and 2-line back-lit alphanumerical LC display.
| Power supply: | 220-240V (AC), 50 W (Fuse 0,3A) or: battery (sealed built-in accumulator 12V / 7,2 Ah) |
| Measuring ranges: | maximum detectable pulse rate: 5000 imp/s (5 kHz) measuring range: 0,0 to 99.999,0 Bq m3 |
| Dimensions: | H 160mm, L 330mm, D 460mm |
| Weight: | 10 kg |
| Acceptable dimensions of scintillation cells: | Max. height: 215mm, Max. diameter: 90mm |
| Independence on the internal battery: | min. 10 hours at fully loaded battery |
| Databases: | Library for 100 scintillation cells (background, constant 1, constant 2, identification No.) 50 measurements (sequential No. of measurement, identification No. of the scintillation cell, date and time of measurement, No. of repeated measurements /max. 20/, uncertainty of measurement, measuring result). |
| Title | Description | Filename |
|---|---|---|
| Leaflet PRM 145 | PRM_145.pdf | |
| Manual PRM 145 | PRM_145_Manual.pdf |
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