Cosmic Ray Detector SORAMAME

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About this app

We have developed a radiation detection application for smartphones and tablets. Cosmic rays are radiation particles that come from space, and more than 100 of them pass through our bodies every second. This app allows you to easily observe and see these invisible cosmic rays. Additionally, the app is designed to be enjoyed not only by individuals but also by people around the world. When a cosmic ray candidate is detected anywhere in the world, it will be displayed on your device screen. You can enjoy different screens when detections occur nearby or more than 1000 kilometers away. Since cosmic ray observations take a long time, please use an old device that is not in use and keep the adapter connected while observing.

This app was developed and released in collaboration with the Department of Applied Physics at Kanagawa University, Hibino Laboratory. Observation results may be used for presentations at academic conferences. If you are interested in this research, please feel free to contact us.

———— Observation Method

After installing the app, simply cover the rear camera to block light and start the app to begin observation.

Light Blocking
If an error message appears due to insufficient light blocking, please cover the rear camera with black tape or place the device in a dark location to prevent light from entering.

Charging Adapter
Please keep the charging adapter connected.

24-Hour Observation
Constant observation allows you to connect with other users around the world. It is recommended to use an old smartphone or tablet that is not in use.

Location Information
You can observe without allowing location information, but the location information is used to calculate the distance to other users. To observe with friends around the world, please enable location information.

For more information on the app screen, please visit this site:


Frequently Asked Questions about the App

What do “Interval,” “Rate,” and “Threshold” mean on the display?
Interval: The time from when the last cosmic ray candidate was detected to when the latest candidate is detected.
Rate: The frequency at which cosmic ray event candidates are detected. The frequency helps distinguish between noise and actual cosmic ray detections since the frequency of cosmic rays observed on the ground is known. The threshold is automatically adjusted to maintain a normal rate.
Threshold: The threshold that distinguishes noise from signals within brightness levels from 0 to 255. For example, if the threshold is set to 30, candidates with brightness levels from 0 to 30 are considered noise and are not counted. Lower thresholds allow more cosmic rays to be detected.

Is there a feature to save detected images?
There is no feature to save images within the app or to the smartphone’s photo app, but detected images can be viewed in real-time on the server. You can check a list of detected images and a frequency graph by tapping the graph icon in the upper right corner of the app screen.

Do I need to allow access to location information to use this app?
Access to location information is not mandatory. You can still observe cosmic rays without allowing it. However, we recommend allowing it whenever possible. Location information is used to calculate the distance to other users' devices and to display on the screen how far away the cosmic ray candidate was detected. Different screens can be enjoyed for detections nearby and far away. Allowing location information does not pose any risk of personal identification. Please enable location information for an enhanced experience.
Updated on
17 Jul 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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Data is encrypted in transit
Data can’t be deleted