The neutron bomb is NOT some gee-whiz, ultra-tech device. It was conceived of in the '60's and '70's. There were even some planned warheads using a neuron warhead , or better known as "enhanced radiation" warhead, but they have not been deployed in any modern weapons system, to my knowledge.
An enhanced radiation weapon ,is a type of hydrogen weapon, that ,instead of multiplying the yield of a fission primary, actually lowers the yield, in EXPLOSIVE force-- BUT, there is a LOT of deadly high-level radiation from these devices.This is how they "kill people, but leave structures intact" They DO produce a nuclear blast, BUT it is much smaller, than a normal nuclear weapon, of similar radiation yield would be.