Location History:
- Inashiki-gun, JP (2005)
- Ami, JP (2006)
- Ibaraki, JP (1998 - 2021)
Company Filing History:
5 out of 6,896 
4 out of 4 
4 out of 179 
Years Active: 1998-2025
Title: Hiroaki Kumada: Innovator in Radiation Shielding Materials
Introduction
Hiroaki Kumada is a prominent inventor based in Ibaraki, Japan, known for his significant contributions to the field of radiation shielding materials. With a total of nine patents to his name, Kumada has developed innovative solutions that enhance safety and efficiency in various applications.
Latest Patents
Kumada's latest patents include a sintered body for radiation shielding material and a fluoride sintered body for neutron moderators. The first patent focuses on a sintered body that effectively shields low-energy-level neutrons, such as thermal and slow neutrons. This material boasts excellent physical properties, including high bending strength and Vickers hardness, which contribute to its superior machining strength. The composition includes lithium fluoride (LiF) ranging from 99 wt. % to 5 wt. %, combined with one or more fluorides like magnesium fluoride (MgF), calcium fluoride (CaF), aluminum fluoride (AlF), potassium fluoride (KF), sodium fluoride (NaF), and/or yttrium fluoride (YF) in varying proportions. The resulting material achieves a relative density of 92% or more, a bending strength of 50 MPa or more, and a Vickers hardness of 100 or more. The second patent describes a fluoride sintered body suitable for moderating high-energy neutrons, which is essential for medical applications, particularly in tumor treatment. This material consists of magnesium fluoride with a compact polycrystalline structure and demonstrates a bulk density of 2.90 g/cm³ or more, along with mechanical strengths that include a bending strength of 10 MPa or more and a Vickers hardness of 71 or more.
Career Highlights
Throughout his career, Kumada has worked with notable companies, including Sumitomo Chemical Company, Limited and Daico Mfg Co., Ltd. His experience in these organizations has allowed him to refine his expertise in materials science and engineering, particularly in the development of advanced radiation shielding technologies.
Collaborations
Kumada has collaborated with esteemed colleagues such as Tetsuyuki Nakamura and Takeshi Ikeda. These partnerships have fostered innovation and contributed to the advancement of radiation shielding materials.
Conclusion
Hiroaki Kumada's work in the field of radiation shielding materials exemplifies his commitment to innovation and safety. His patents reflect