Development of nanosecond pulsed laser decontamination method, 2; In-situ time- and space-resolved detection of micro/nano dusts

Kosuge, Atsushi  ; Ando, Kota*; Nakajima, Takashi*

Decommissioning generates a large amount of radioactive waste. Laser decontamination has been attracting attention in recent years as an efficient and safe method of decontamination. Since the micro- and nano-dust generated by laser decontamination is radioactive, it is also important to collect the scattered micro- and nano-dust. In this presentation, we report spatially resolved measurements of micro/nano dust particles by irradiating uncontaminated metal samples with highly repetitive nanosecond laser pulses. First, the shape and distribution of particles attached to several cover glasses placed in a hemispherical shape near the laser irradiation point were observed using a laser microscope. Next, laser scattering measurements of particles were performed using a collimated beam and a horizontally spread laser sheet.