METHOD FOR REMOTE DETECTION OF RADIOACTIVE SUBSTANCES IN FIELD CONDITIONS Russian patent published in 2019 - IPC G01T1/02 G01N21/63 

FIELD: measurement technology.

SUBSTANCE: invention relates to measurement of ionizing radiation and a method for remote detection of radioactive substances in field conditions based on double-beam laser-induced breakdown of air. Method involves exposure of the investigated area with two lasers, detection of a signal reflected from the ionized region. Photon-ionizing laser is a compact fiber erbium laser. As probing, powerful focusing laser for avalanche breakdown of air pulsed CO₂-laser is used. To detect a laser beam reflected from an ionized region formed near radioactive substances, a compact non-inertial infrared photodetector is used based on the photon drag effect with a time constant of less than 1 ns. Reflected laser beam is used to measure the delay time of air breakdown, which depends on the level of radiation.

EFFECT: reduction of power consumption and weight and dimension parameters of equipment, improvement of safety, reliability and speed of remote probing.

1 cl, 3 dwg