Interface Overview

Before diving into measurements, it helps to know your way around the mDOS interface. This chapter explains the elements that appear on every page, how to navigate between pages, and what the LED indicators on the detector itself mean.

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The Header

The header runs across the top of every page in the interface.

Element	Description
Page title	The name of the page you are currently on
Active project	Shown below the page title — the project that data is currently being logged to
Sensor status indicators	Top right corner — a quick overview of the current status of the Spectrometer, PTH, and GPS
Notification bell	Top right corner — opens the notifications panel
Stabilization progress	Shown in the header whenever the spectrometer is stabilizing, for example: "The spectrometer is stabilizing (50%)". The percentage updates in real time.
Measurement paused	A yellow banner reading "Measurement Paused" is shown in the header whenever the measurement is paused. Data is still being recorded but is marked as paused.

Info

Stabilization is the automatic self-calibration process of the sensors and is performed each time the detector is powered on. Radionuclide concentrations are only displayed after the stabilization process has been completed. Depending on the crystal size and ambient radiation levels, this typically takes a few minutes. See Viewing the Spectrum for a detailed explanation of what stabilization is and why it is needed.

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Navigation

The sidebar on the left gives access to all pages in the interface. It is available on every page.

Page	Description
Dashboard	Sensor status, project shortcuts, and quick links
Projects	Create, continue, review, and download projects
Survey	Live map view for field measurements
Review project	Explore recorded data from any project on a map without affecting the active project
Spectrum	Live spectrum plot and radionuclide concentrations
Settings	System, sensor, WiFi, map, and communication settings

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Sensor Status Indicators

The sensor status indicators in the header give a real-time overview of each sensor. The same indicators appear in more detail on the Dashboard.

All sensors share the following statuses:

Icon	Status	Description
	Unknown	No data has been received from this sensor since the detector started
	Inactive	No data has been received for longer than 10 times the configured interval
	Active	The sensor is working normally

The Spectrometer and GPS have additional statuses:

Spectrometer

Icon	Status	Description
	Stabilizing	The spectrometer is collecting counts to calculate the energy stabilization. Progress is shown in the header.

GPS

Icon	Status	Description
	No antenna	The GPS antenna is not connected
	No signal	The GPS is running but no satellites are detected
	Acquiring	Satellites detected, but no GPS fix established yet

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The Dashboard

The Dashboard is the landing page after the welcome screen. It is divided into three sections.

Tasks

The Tasks section provides shortcuts to the three main workflows.

Task	Description
Start new project	Opens a form to create a new project, which immediately becomes the active project
Continue project	Opens a list of existing projects — selecting one makes it the active project
Review project	Opens a project in the Review project page for inspection

Sensor Data

The Sensor data section shows the latest reading from each connected sensor.

Sensor	Data shown
Spectrometer	Count rate (cps) and dose rate (µGy/h)
PTH	Pressure (hPa), Temperature (°C), Humidity (%)
GPS	Date, fix type, accuracy (m)
Altitude	Height (m) — only shown when an external altitude source is active (Lidar or NMEA with RMZ messages). Incoming height data is displayed live in this row.
RS232	Only shown when an RS232 input mode is active (RTCM, CSV, JSON, or Text) — displays the incoming data on the serial port live in this row.

Info

Note: The dose rate is only displayed once the spectrometer has stabilized. The count rate is always shown.

Each sensor row has an info button () on the right. Clicking it opens a panel with the sensor type, measurement interval, and a live data stream showing the most recent JSON strings received from that sensor.

Handy Links

The Handy links section provides quick access to this manual, the Medusa technical documentation, the support portal, and the Medusa Radiometrics website.

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Notifications

The notification bell in the header shows a badge when there are unread notifications. Clicking it opens a panel with recent notifications. All notifications can also be viewed on the dedicated Notifications page.

Notifications are generated automatically by the detector when something requires your attention. The following events trigger a notification:

Notification	Trigger
Sensor data alert	A sensor has not received data for longer than 10 times the configured interval — the sensor is now considered inactive
Disk space warning	Storage usage has exceeded the configured threshold percentage
Disk space back to normal	Storage usage has dropped back below the threshold
GPS disconnected	The GPS antenna has been disconnected from the detector
Disk full — writing stopped	The storage is completely full and the detector has stopped logging new data (only occurs when Overwrite files when full is disabled)

Each notification shows a title, timestamp, and short description. Notifications can be marked as read individually or all at once using Mark all as read.

Info

Note: The disk space threshold and the overwrite behaviour can be configured under Settings → System → Storage.

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LED Indicators on the Detector

The detector has four LEDs on the top cap. Their position relative to the connector depends on the detector model — some are mounted with the wings down (e.g. MS-2000), others with the wings up (e.g. MS-350, MS-1000).

LED	Colour	Meaning
PWR	Green	Input voltage is OK
	Red	Input voltage is too low
	Red blinking (1 Hz)	Input power could not be measured
	Blue	Input voltage is too high — internal electronics may be at risk
	Purple	Input voltage has large fluctuations — check the power supply
ETH	Green	Connected to a network (Ethernet or Wi-Fi)
	Blue	Connected to a network with active internet access
SCN	Yellow	A raw spectrum is being collected
	Green	A spectrum has been stabilized, analysed, and stored
AUX	Yellow	A PTH reading is collected and stored
	Green	A GPS reading is collected and stored
	Blue	An auxiliary reading is collected (external sensor)

Note

Warning: If both the SCN and AUX LEDs blink red, the internal storage is almost full. The threshold and the action taken when storage is full can be configured under Settings → System → Storage. The default action is to overwrite the oldest inactive project.