Status of laser Compton scattered gamma-ray source at JAEA 150-MeV microtron

We have developed a laser Compton scattered (LCS) gamma-ray source based on a 150-MeV racetrack microtron at Japan Atomic Energy Agency. The microtron equipped with a photocathode RF gun accelerates a single bunch of electrons to collide with a laser pulse from a Nd: YAG laser. Such gamma-ray source realizes industrial application of nuclear material detection in a ship cargo, which is one of the urgent requests of international nuclear security. Recent status of LCS gamma-ray source development is presented.