URSA-II – Universal Radiation Spectrum Analyzer

The URSA II is a flexible multi‑channel analyzer (MCA) system designed to work with virtually any radiation detector, enabling users to capture and analyze a wide range of radiation data. With a full‑featured MCA program, the URSA II can extract and process all available data generated by compatible detectors, supporting advanced spectroscopy and radiation analysis applications.

Designed for Broad Compatibility & Data Extraction

Engineered with feedback from existing URSA users, the URSA II has been refined to maximize detector compatibility, data accessibility, and analytical capability. Its flexible architecture allows it to be used with a wide variety of radiation detectors, making it suitable for both laboratory and research environments requiring detailed spectral analysis.

User‑Friendly Windows‑Based MCA Software

The URSA II includes a fully quantitative, Windows™‑based MCA software package designed for intuitive operation within a familiar Windows environment. The software simplifies spectrum acquisition, analysis, and data management while maintaining robust analytical functionality for professional users.

Free Software with Unlimited Installations

URSA II software is available as a free download from the manufacturer’s website, with no restrictions on the number of computers on which it can be installed. This allows flexible deployment across laboratories, workstations, and analysis systems without licensing limitations.

Software Includes

Fully editable standard libraries include all 497 isotopes listed in “Kocher’s Radioactive Decay Tables.”

Multi-channel scaling mode, peak search and identify, quantification based on ROIs or peaks search.

Dual-channel emulator allows use with gas proportional or phoswich detectors as a “gross alpha/beta” counter-scaler.
Sophisticated multiple alarm functions are based on the overall count rate, individual ROIs, exceeding a specific rate or an increase in rate over a specific time interval. Alarms can trigger external devices.

Provisions are included for acquiring and saving spectra repeatedly and continuously while unattended. Spectra can be saved and reloaded to “live” for re-analysis or additional data accumulation, or loaded as a background spectrum. Saved spectra can be superimposed on the “active” spectrum for comparison. Spectrum format is easily accessible by a spreadsheet program. All reports can be previewed, printed, or saved as text or rich text files.
“ASCII” mode allows control of and data collection from the URSA-II with user’s own software or hardware.

Additional Specifications

4096-channels, can also be configured for 256, 512, 1024, or 2048 channels. Internal bias voltage supply provides positive high voltage from 0 to 2000V at up to 0.5mA (Negative High Voltage available upon request). Adjustable shaping time, 0.25 to 10 µs. A wide gain range can be achieved by utilizing coarse and fine gain controls from x1 to x250.

Probe Connectors

Two detector inputs. One standard series “C” connector for detectors where the signal is joined with the high voltage supply. The other is for detectors having separate connections for high voltage (SHV connector) and signal (BNC connector). Active detector input is selected via software, and can be negative, positive, or pre-shaped (positive) signal.

External Connector

External connector provides +5V, +12V, and -12V for external preamplifiers and two logic signals for notifying external devices of alarm conditions.

Switches

Power On/Off, (Internal switch located in the battery compartment suppresses battery-charging circuitry for when non-rechargeable batteries are being used.)

LED Indicators

On/Off, External power indicator, and charge status

Minimum System Requirements

Computer running Windows10 or 11. Has been tested on Windows ME, 2000 and XE

Power Requirements

External 12VDC power supply, six “AA” NiMH rechargeable batteries (included) with internal recharging, or six standard alkaline “AA” batteries (Not included). External 12VDC power jack allows instrument to plug into vehicle (Not included). The URSA-II is fully portable with hours of battery life and PPC Compatibility.

What Our Clients Say

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Ron Ulbrich, Geiger Counter Pro

“The Radiation Alert Ranger® is a great value for those looking for a modern Geiger counter. I found that is simple to use yet includes many advanced functions if and when you want them without obstructing the simplicity…”

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Judson Kenoyer, CHP, CIH

“I have used the Monitor 4 in courses that I teach radiation safety for close to 8 years. The students love it and affectionately call it the “Batman unit” because of its use in the movie The Dark Knight Rises. It is light-weight, sensitive, and quite often out performs some of the more expensive units from other companies that we use in a lab exercise…”

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Neil Breslow, NDT Supply

“NDT Supply has been working with SE International since we started business in 2000. We have found them to be easy to work with, and a very reliable and responsive supplier. Questions and issues are always handled promptly and with a smile…”

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Michael, Patriots Antiques

“Your Ranger changed how I run my business. It’s accurate, easy to use, and perfect for detecting uranium glass.”

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Christopher Ulriksen, CSP, M.S.

“Great product, even better support. Quick replies, solid calibration—SE International is my go-to.”

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Gregory Field, USMC/ARNG Ret.

“We used SE monitors in Iraq and Afghanistan—sandstorms, snow, even camel licks couldn’t break them. Only mortar fire did. I’ve trusted them ever since.”