The invention belongs to a 
neutron source, and particularly relates to a turn-off planar radio-frequency 
ion source drive-in target 
neutron tube. The 
neutron tube is mainly composed of a planar radio-frequency 
ion source, a gas storage element, accelerating electrodes, a target and a vacuum 
system. The planar radio-frequency 
ion source substitutes for a penning source and is composed of a small-recombination-coefficient 
quartz discharge cup, a planar 
helical antenna clinging to the cup bottom and a 
Kovar material leading-out pole sealing the cup rim, a cusped 
magnetic field is formed by a plurality of magnets along the 
tube diameter of the 
discharge cup, 
plasma density is increased, and 
electron motion is limited while recombination losses of the tube wall are reduced. Radio-frequency power is transmitted to 
plasma from the antenna by means of 
inductive coupling. A shielding case is added to the outside of the 
ion source, influence of the radio-frequency 
electric field on other equipment is reduced, saturation adsorption of 
deuterium-
tritium gas is realized by the internal gas storage device, and heating release is performed. The proportion of monatomic ions is increased greatly, 
utilization rate of reaction gas is increased, 
sputtering of a leading-out hole is reduced, and accordingly yield of the neutron tube is increased while service life of the same is prolonged.