Abstract
AbstractComplementary metal oxide semiconductor (CMOS) cameras have been used to detect ionizing radiation when shaded from light or under the condition of static scenes. We propose a novel idea for simultaneous measurement of ionizing radiation and heart rate (HR) by using a smartphone with its CMOS camera lens covered by a finger in one measurement. Verified experiments were conducted: videos were recorded using a Xiaomi8 smartphone when the camera lens was covered by a finger and a light-tight tape for controlled experiment, with a ∼33 mCi 99mTc liquid radioactive source at six different distances (from 20 to 70 cm, step size 10 cm) from the camera. The exact HRs were measured using an oximeter at the same time. Image processing algorithm is proposed to extract radiation events and HR in the same videos. Results show that: (1) frame numbers containing radiation-related bright spots in two experiments have a linear relationship, and they are inversely proportional to the square of the distance between the camera and radiation source; (2) the HR difference between the video processing and the oximeter result is less than 2 beats per minute. In conclusion, it verifies that the proposed method is available to detect ionizing radiation and measure HR simultaneously with smartphone camera lens covered by a finger. We have been working on the development of an Android phone application based on the algorithms.
Highlights
The extensive application of nuclear technology in industry, agriculture, medical science, and other fields has greatly promoted economic construction and development of the world
We propose a novel idea for achieving ionizing radiation detection by using a smartphone with the Complementary metal oxide semiconductor (CMOS) camera lens covered by a finger instead of a light-tight device, which can measure the heart rate (HR) simultaneously
Videos recorded by the smartphone with its camera lens completely covered by a light-tight tape and a finger were processed by our proposed algorithm
Summary
The extensive application of nuclear technology in industry, agriculture, medical science, and other fields has greatly promoted economic construction and development of the world. Potential safety hazards that nuclear technology may bring cannot be ignored, and various radioactivity-related accidents occurred, such as nuclear leakage of Fukushima Daiichi nuclear power plant in March 2011 [2] and Jilin Daqing Drilling and Detecting Well Company lost the container containing radioisotope in September 2016 [3]. Nuclear radiation detection is crucial to ensure nuclear security. It can reduce the probability of a nuclear accident on one hand and reduce its damage after a nuclear accident on the other
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