SunRADON XP

SunRADON classifies the XP as an active continuous radon monitor with a single solid-state photodiode detector, and describes the detector design as passive airflow diffusion: room air reaches the detector on its own, with no pump. The data sheet gives a measurement range of 0.1 to 9,999 pCi/L, a nominal sensitivity of 2.7 counts per hour per pCi/L, a typical background of 0.2 pCi/L (0.5 pCi/L at most) and an uncertainty of 7% over one day. SunRADON's 2020 comparison chart ties that uncertainty figure to the ANSI-AARST MS-PC 2015 standard. Readings are shown in pCi/L or Bq/m³, chosen in the monitor's settings.

Each test is set up with a duration of 1 to 999 hours, a start delay of 0, 12, 24 or 48 hours, and a recording interval of 1, 4, 8 or 12 hours, and it can be started and stopped on the 2.8-inch color touchscreen or from the OneRADON app. While a test runs, the screen shows a progress bar and cycles through the current reading, the EPA and overall averages and a chart, and an icon marks a monitor that was moved during the test. SunRADON says these on-screen results are protected from client view. The memory holds 10,000 data points across 10 test slots, and a 4-digit PIN and a motion sensor guard against tampering.

The reporting side is SunRADON's OneRADON software, which the data sheet lists for Windows, macOS, iOS, Android and the cloud. A phone connects to the XP over Bluetooth from inside the app, with no adapter, and a Windows or Mac computer connects over USB only. In the app a technician syncs the monitor's date and time, starts a test, retrieves the data and builds an inspection report with the test times, a chart, site photos and a checklist of the testing protocols followed. A Specialist mode gives qualified inspectors full use of the software; with it off, a technician sends the data to a specialist for review and approval. SunRADON says report templates can carry a company's name and logo, and the data sheet lists an ANSI/AARST compliant QC module with comparison checks and duplicate test support.

Power comes from four AA alkaline batteries or a USB-C connection; the data sheet lists an AC-USB supply at 5 VDC, rated for 100 to 240 V. SunRADON's guide says four new alkaline batteries typically run the monitor for 280 to 300 hours of continuous measurement, depending on how much the touchscreen is used, that rechargeable batteries are not recommended, and that on USB power the batteries act as backup, so switching between the two does not interrupt a test. The data sheet's operating range is 45 to 95°F and 10 to 90% relative humidity, non-condensing.

The XP began as the 1028 XP Continuous Radon Monitor from Sun Nuclear, whose radon line is now SunRADON LLC. In 2024 SunRADON shortened the name to XP and turned the 1028-XP's optional modules into models of their own: the 1028-XP with the environmental (ENV) module is now the XP+, which adds humidity, temperature and pressure monitoring, and the one with the LTE module is now the XP+ Cellular, which adds a cellular link to connect, control and generate reports remotely. SunRADON's 2020 guide to that module says it used AT&T's network in North America and synchronized with the cloud hourly. This page covers the base XP. SunRADON's documents disagree on one detail: one row of the data sheet lists the humidity, temperature and pressure sensors for the XP and XP+ Cellular, while the same sheet's model table and the product page give them only to the XP+ and XP+ Cellular. This page follows the product page.

Two independent programs list the monitor under its former name. The National Radon Safety Board's list of approved radon measurement devices, dated July 2026, includes the SunRADON2 1028-XP continuous radon monitor as device 31826, with a note that SunRADON was formerly Sun Nuclear; NRSB adds that approving a device does not imply accreditation or certification of its maker. C-NRPP, the Canadian program, names the Sun Nuclear 1028-XP under SunRadon among the professional-grade electronic radon monitors on its professional device list, and says such devices need to be calibrated annually by the manufacturer and are different from consumer-grade monitors.

The monitor also appears in a peer-reviewed study, though not as the device under test. A 2026 paper in Sensors used Model 1028 XPs as the reference instruments for checking SunRADON's consumer lüft monitor in six rooms of a school in Utah, for about 29 weeks in 2024. The authors say they chose the 1028 XP because it is calibrated annually by its manufacturer and reports an hourly average every hour, and that SunRADON calibrated their units for radon, but not for the other air-quality readings, before the study. Over the study, the 1028 XPs' 24-hour average radon ranged from 0.44 to 22.49 pCi/L.