Unattended outdoor gamma monitoring beyond the network

Area gamma monitoring around nuclear facilities, mineral-processing plants, hospitals and industrial radiography sites has historically relied on mains-powered enclosures wired back to a control room. The cabling cost, the dependence on facility power and on cellular or Wi-Fi coverage, and the routine site visits needed to keep instruments charged, calibrated and on-line are a significant share of the total cost of ownership. In remote and perimeter locations, they are often the reason a measurement point is simply not deployed.

Elementz, through its Nucleolenz product line, was tasked with building an outdoor area gamma monitor that could be dropped into a remote location and left alone — including locations with no cellular coverage and no facility network. The unit had to survive outdoor exposure, run on its own harvested energy, push readings to the central server in real time without operator action, and accept calibration adjustments without anyone climbing up to the device.

The engineering constraints were tight: keep a detector and its electronics powered around the clock from a 3 W solar panel and a 2500 mAh battery through low-light days; cover four decades of dose rate — 0.01 to 100 mR/h — on one channel without range switching; and meet IP65 while still letting the solar panel harvest and the antenna radiate.

The EGM-L210Y1 pairs a low-power detector readout with a LoRa radio link that reaches up to 8 km line-of-sight between the field unit and the site gateway. A single gateway collects a wide ring of field units, which makes site-wide coverage economical instead of cabling-heavy — the monitor keeps reporting from kilometres beyond where conventional units stop.

The two-part enclosure — ABS base, polycarbonate lid — is validated to IP65, with the solar panel integrated into the lid and a single Type-C service port. Detector signal-conditioning handles both GM tube and scintillator sensors across the full 0.01–100 mR/h range. A Wi-Fi access-point mode handles first-time commissioning in the field, and calibration factors are pushed to deployed units from the server.

Hands-off by design

An always-on telemetry client uploads dose-rate readings, alarms and device health to the Nucleolenz central server the moment they exist on the device, with on-device buffering across link drops — the gap replays as soon as the link returns, so the central record stays complete. Calibration coefficients, thresholds and configuration flow back down the same link.

One team, six layers

Detector front-end, power electronics, LoRa link, mechanical enclosure, firmware and server UI were all designed inside Elementz — which is what made the power budget close: firmware duty-cycling, front-end current draw, LoRa transmit cadence and solar/battery sizing were tuned against each other rather than handed over a wall. At the gateway, relay, 4–20 mA, RS-485 and Ethernet are available on the same unit, so the system drops into existing SCADA and monitoring backbones.