The elemental composition on planetary surface is essential information to the planetary science. The X-ray, gamma-ray, and neutron measurement is a powerful method to obtain such information on the airless celestial body. An active X-ray spectrometer (AXS), an HPGe gamma-ray spectrometer (GS), and a scintillator-based neutron spectrometer (NS) are now being developed at Waseda University for future planetary exploration. Also we have proposed the AXS to the next Japanese lunar landing mission, and the gamma-ray and neutron spectrometer (GNS) to a remote sensing and sample return mission on the Martian moon (Phobos/Deimos). The AXS and GNS are in-situ chemical element analyzers having the capability to determine the concentration of chemical elements as Mg, Al, Si, K, Ca, Ti, Fe, for AXS and GNS, and also H, O, S, Cl, Th, U, etc. for GNS, all depending on their concentration.
The AXS consists of a silicon drift detector and multiple X-ray generators. A pyroelectric X-ray generator is employed for the X-ray generator of AXS, because it is compact, lightweight, and it does not use a radioisotope and a high voltage power supply. On the other hand, the GS consists of anHPGe gamma-ray detector and a plastic scintillator as an anti-coincidence counter. Also the NS consists of a lithium-glass and a boron-loaded-plastic scintillators and an anti-coincidence plastic scintillator. We are aiming to reduce the GNS weight to be less than 8 kg.
The performance and current development status of the above spectrometers will be presented.

Host: Prof. Karl Giboni