radiation detectors

A video is getting a lot of attention! The video shows people holding a Geiger counter. Every time a suspicious jar is opened, the image blurs, making people speculate whether a strong source of radiation is hidden inside. However,digital nitrate tester the author of the video has denied that it is just a special effects video.

Many have explained the implausibility of the video. So, can radiation really cause a camera to react abnormally? First of all, there is the working principle of a cell phone camera. At the heart of a cell phone camera is a CMOS sensor that converts light into an electrical signal that is then processed internally by the phone to form an image.

The CMOS sensor converts light signals into electrical charges and stores them in a semiconductor material. They can then be read and converted into return signals. Ionizing radiation is high energy and can cause CMOS sensors to "image",radiation detectors resulting in noise. This noise represents each pixel being illuminated once, but in natural environments, a small amount of noise can also be generated by background radiation.

However, due to the small area of the sensor in the lens, it is difficult to notice the noise caused by the development of our background radiation when doing everyday photography. Cell phones can simultaneously capture background radiation through long exposures, which is as a relatively simple method.

Use black tape, tinfoil, or keep the phone in the dark to effectively mask the lens. Also,geiger counter handheld based on the above principle, we can estimate the current radiation value by the number of noise spots.

So we can use the cell phone as a Geiger counter and use noise detection software to do this. This software requires a camera license and a storage license to detect radiation and store typical noise maps. You need to cover the lens before use to avoid light interference.

Enter the software and start measuring the radiation. At the top of the screen, we can see the average noise figure and current noise figure, as well as the run time, detection threshold and typical noise detection figure. If typical noise is detected, the software will automatically zoom in on the area and save the image to an album.

Note that the lens must be shaded when in use. Also, in situations where the radiation level is low (e.g. measuring the background), long exposures are required. This is the time to pay attention to the heat and battery power of the phone. Due to the limitations of sensor size and performance, electromagnetic interference and poor shading, the measurement results of the software may have a large error and are for reference only or to roughly judge the current radiation level in extreme or emergency situations.

The measurement results of such software we can not directly as the actual measurement data through the use. If a need for accurate measurement, or the development of the need to use more professional radiation detection instruments.

CMOS sensor Geiger counter radiation