@article{oai:repo.qst.go.jp:00082654,
 author = {Nagaoka, Hiroshi and Okada, Tatsuaki and Kusano, Hiroki and Tanaka, Naomichi and Naito, Masayuki and Hasebe, Nobuyuki and Hiroki, Kusano and Masayuki, Naito},
 issue = {2},
 journal = {Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan},
 month = {Mar},
 note = {The performance of pyroelectric X-ray generator (PXG) under high vacuum (down to 2.2 × 10-5 Pa) is investigated with two different gases of dry air and N2, in order to develop a high-intensity X-ray generator. For both gases, the X-ray intensity decreases for pressures less than 1 × 10-4 Pa. It is required to control appropriate inner-gas pressure (1 - 10-3 Pa) to obtain high X-ray intensity, when PXG is used as an active X-ray source for future planetary exploration missions. Furthermore, an analytical system with a carbon nanotube X-ray generator is also discussed for light-element measurement.},
 pages = {193--198},
 title = {Development and Improvement Status of Active X-Ray Generators for Future Lunar and Planetary Landing Observations},
 volume = {19},
 year = {2021}
}