Probing Method for Unstable Dust Source Location of Dust Falling
A technology for reducing dust and dust sources, applied in the direction of instruments, etc., can solve the problems that the detection of occurrence sources cannot be fully applied, cannot be approached to dust sources, and is not an appropriate method
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no. 1 approach
[0151] By means of dustfall measurement (device) every time period Δt d The amount of falling dust (mass of falling dust) is measured (hereinafter, "time period" is simply referred to as "period" as necessary). Let the output time of the measured value of dust fall be t d (i t ). will start from time t d (i t -1) to time t d (i t ) of time (period) is defined as "period T d (i t )". i t It is an integer that increases one by one by setting the time when the dust fall measurement starts to 0. In addition, let n t is a natural number above 2, it will be represented by n t a continuous "period T d (i t )” constitutes the time defined as the “period T g (k)". Here, let "period T g (k)" is the time t g (k-1), at this time i t is 0. Set "period T g (k)" is the end point of time t g (k), at this time i t for n t . K is an integer that is incremented one by one by setting the time at which the measurement of dust fall is started to 0. In this embodiment, each "...
no. 2 approach ）
[0212] Next, a second embodiment of the present invention will be described.
[0213] When it is clear in advance that the dust source is limited to the height near the ground surface, the dust source detection area is not set in a three-dimensional area like the first embodiment, but the dust source detection area is set in a horizontal plane (in a two-dimensional area) , so that the process of dust source detection can be simplified, and the calculation burden required for dust source detection can be reduced.
[0214] Specifically, in image 3 In step S4, the dust source detection device omits the dust source detection area γ (i M , i t ), γ (i N , i t ) of the central axis in the vertical direction and the vertical diffusion width σ z (Let the elevation angle θ be 0°, the diffusion width σ z is 0), the dust source detection area γ (i M , i t ), γ (i N , i t ) two-dimensional.
[0215] The position vectors P and Sc in steps S2 and S8 are also two-dimensionally ve...
no. 3 approach
[0229] It is possible to measure the radiation of fallout collected at the evaluation site, and to classify (sample of) each fallout particle or (sample of) the fallout particle as a whole into radioactive fallout or non-radioactive fallout based on its intensity, (or only non-radioactive fallout) as the object, the detection of unstable dust sources of radioactive fallout (or non-radioactive fallout).
[0230] As a method of measuring the radiation intensity of falling dust, a known method can be used. For example, the methods described in Patent Documents 7 to 9 can be used.
[0231] The classification method of dustfall samples based on radiation intensity can be: for example, the d (i t ) (from time t d (i t -1) to time t d (i t) of the time (period)) in the sample collected at each evaluation site, each dustfall particle is separated one by one to measure its respective radiation intensity. Particles are classified as radioactive fallout, and other fallout particle...
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