Takeshi Kai

2.6k total citations · 2 hit papers
69 papers, 1.8k citations indexed

About

Takeshi Kai is a scholar working on Atomic and Molecular Physics, and Optics, Radiation and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Takeshi Kai has authored 69 papers receiving a total of 1.8k indexed citations (citations by other indexed papers that have themselves been cited), including 35 papers in Atomic and Molecular Physics, and Optics, 25 papers in Radiation and 24 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Takeshi Kai's work include Atomic and Molecular Physics (30 papers), Radiation Therapy and Dosimetry (22 papers) and X-ray Spectroscopy and Fluorescence Analysis (17 papers). Takeshi Kai is often cited by papers focused on Atomic and Molecular Physics (30 papers), Radiation Therapy and Dosimetry (22 papers) and X-ray Spectroscopy and Fluorescence Analysis (17 papers). Takeshi Kai collaborates with scholars based in Japan, United States and Austria. Takeshi Kai's co-authors include Tatsuhiko Sato, Tatsuhiko Ogawa, Koji Niita, Norihiro Matsuda, Yosuke Iwamoto, Shinichiro Abe, Takuya Furuta, Shintaro Hashimoto, Nobuhiro Shigyo and Hiroshi Iwase and has published in prestigious journals such as Physical Review Letters, The Journal of Chemical Physics and SHILAP Revista de lepidopterología.

In The Last Decade

Takeshi Kai

67 papers receiving 1.7k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Features of Particle and Heavy Ion Transport code System (PHITS) version 3.02

2018 888 citations Tatsuhiko Sato, Yosuke Iwamoto et al. Journal of Nuclear Science and Technology profile →
Recent improvements of the particle and heavy ion transport code system – PHITS version 3.33

2023 122 citations Tatsuhiko Sato, Yosuke Iwamoto et al. Journal of Nuclear Science and Technology profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Takeshi Kai Japan	17	972	677	390	359	337	69	1.8k
Hans Rabus Germany	27	844 0.9×	595 0.9×	376 1.0×	341 0.9×	189 0.6×	126	2.0k
Takuya Furuta Japan	18	1.5k 1.5×	880 1.3×	590 1.5×	556 1.5×	597 1.8×	60	2.4k
N. Yasuda Japan	25	1.2k 1.3×	828 1.2×	156 0.4×	375 1.0×	249 0.7×	161	2.0k
C. Villagrasa France	24	1.1k 1.1×	2.0k 2.9×	190 0.5×	249 0.7×	493 1.5×	64	2.4k
Tatsuhiko Ogawa Japan	13	1.4k 1.4×	813 1.2×	648 1.7×	545 1.5×	456 1.4×	61	2.1k
Satoshi Kodaira Japan	24	1.1k 1.2×	770 1.1×	111 0.3×	292 0.8×	261 0.8×	196	1.9k
P. Nieminen Netherlands	19	883 0.9×	1.1k 1.6×	135 0.3×	221 0.6×	272 0.8×	91	1.9k
B. Großwendt Germany	27	1.2k 1.2×	1.2k 1.8×	84 0.2×	271 0.8×	451 1.3×	126	2.1k
Norihiro Matsuda Japan	22	1.6k 1.7×	953 1.4×	819 2.1×	632 1.8×	545 1.6×	74	2.7k
Marie‐Claude Bordage France	25	614 0.6×	955 1.4×	110 0.3×	416 1.2×	556 1.6×	42	2.1k

Countries citing papers authored by Takeshi Kai

Since Specialization

Citations

This map shows the geographic impact of Takeshi Kai's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Takeshi Kai with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Takeshi Kai more than expected).

Fields of papers citing papers by Takeshi Kai

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Takeshi Kai. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Takeshi Kai. The network helps show where Takeshi Kai may publish in the future.

Co-authorship network of co-authors of Takeshi Kai

This figure shows the co-authorship network connecting the top 25 collaborators of Takeshi Kai. A scholar is included among the top collaborators of Takeshi Kai based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Takeshi Kai. Takeshi Kai is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Matsuya, Yusuke, Tamon Kusumoto, Tatsuhiko Ogawa, et al.. (2025). Development of a chemical code applicable to ions based on the PHITS code for efficient and visual radiolysis simulations. Physical Chemistry Chemical Physics. 27(14). 6887–6898. 1 indexed citations

Kai, Takeshi, et al.. (2025). Multiple DNA damages induced by water radiolysis demonstrated using a dynamic Monte Carlo code. Communications Chemistry. 8(1). 60–60. 1 indexed citations

Ogawa, Tatsuhiko, Yuho Hirata, Yusuke Matsuya, et al.. (2024). Overview of PHITS Ver.3.34 with particular focus on track-structure calculation. SHILAP Revista de lepidopterología. 10. 13–13. 2 indexed citations

Kai, Takeshi, et al.. (2024). Significant role of secondary electrons in the formation of a multi-body chemical species spur produced by water radiolysis. Scientific Reports. 14(1). 24722–24722. 2 indexed citations

Matsuya, Yusuke, et al.. (2024). Changes in molecular conformation and electronic structure of DNA under 12C ions based on first-principles calculations. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 548. 165231–165231. 1 indexed citations

Hirata, Yuho, Takeshi Kai, Tatsuhiko Ogawa, Yusuke Matsuya, & Tatsuhiko Sato. (2023). Development of an electron track-structure mode for arbitrary semiconductor materials in PHITS. Japanese Journal of Applied Physics. 62(10). 106001–106001. 3 indexed citations

Matsuya, Yusuke, Tamon Kusumoto, Ken Akamatsu, et al.. (2023). A step-by-step simulation code for estimating yields of water radiolysis species based on electron track-structure mode in the PHITS code. Physics in Medicine and Biology. 69(3). 35005–35005. 4 indexed citations

Matsuya, Yusuke, et al.. (2023). An Analytical Method for Quantifying the Yields of DNA Double-Strand Breaks Coupled with Strand Breaks by γ-H2AX Focus Formation Assay Based on Track-Structure Simulation. International Journal of Molecular Sciences. 24(2). 1386–1386. 5 indexed citations

Sato, Tatsuhiko, Yosuke Iwamoto, Shintaro Hashimoto, et al.. (2023). Recent improvements of the particle and heavy ion transport code system – PHITS version 3.33. Journal of Nuclear Science and Technology. 61(1). 127–135. 122 indexed citations breakdown →

10.

Sato, Tatsuhiko, Yusuke Matsuya, Tatsuhiko Ogawa, et al.. (2023). Improvement of the hybrid approach between Monte Carlo simulation and analytical function for calculating microdosimetric probability densities in macroscopic matter. Physics in Medicine and Biology. 68(15). 155005–155005. 12 indexed citations

11.

Hirata, Yuho, Takeshi Kai, Tatsuhiko Ogawa, Yusuke Matsuya, & Tatsuhiko Sato. (2023). Development of a model for evaluating the luminescence intensity of phosphors based on the PHITS track-structure simulation. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 547. 165183–165183.

12.

Kai, Takeshi, et al.. (2023). First-principles simulation of an ejected electron produced by monochromatic deposition energy to water at the femtosecond order. RSC Advances. 13(46). 32371–32380. 4 indexed citations

13.

Hirata, Yuho, Takeshi Kai, Tatsuhiko Ogawa, Yusuke Matsuya, & Tatsuhiko Sato. (2022). Implementation of the electron track-structure mode for silicon into PHITS for investigating the radiation effects in semiconductor devices. Japanese Journal of Applied Physics. 61(10). 106004–106004. 6 indexed citations

14.

Kai, Takeshi, et al.. (2022). Impact of the Lorentz force on electron track structure and early DNA damage yields in magnetic resonance-guided radiotherapy. Scientific Reports. 12(1). 16412–16412. 2 indexed citations

15.

Matsuya, Yusuke, Takeshi Kai, Tatsuhiko Sato, et al.. (2021). Verification of KURBUC-based ion track structure mode for proton and carbon ions in the PHITS code. Physics in Medicine and Biology. 66(6). 06NT02–06NT02. 23 indexed citations

16.

Tsubata, Yasuhiro, et al.. (2020). Re-evaluation of Radiation-Energy Transfer to an Extraction Solvent in a Minor-Actinide-Separation Process Based on Consideration of Radiation Permeability. Solvent Extraction and Ion Exchange. 39(1). 74–89. 2 indexed citations

17.

Kai, Takeshi, et al.. (2012). Development of a simulation method for dynamics of electrons ejected from DNA molecules irradiated with X-rays. International Journal of Radiation Biology. 88(12). 928–932. 1 indexed citations

18.

Kai, Takeshi. (2011). Radiation damage of C₁H₁, N₁H₁and O₁H₁clusters induced by irradiation with x-ray free electron lasers. Physica Scripta. T144. 14050–14050. 2 indexed citations

19.

Inubushi, Yuichi, Takeshi Kai, Tatsufumi Nakamura, et al.. (2007). Analysis of x-ray polarization to determine the three-dimensionally anisotropic velocity distributions of hot electrons in plasma produced by ultrahigh intensity lasers. Physical Review E. 75(2). 26401–26401. 22 indexed citations

20.

Kawamura, Tohru, Takeshi Kai, Fumihiro Koike, et al.. (2007). Polarization ofHeαRadiation due to Anisotropy of Fast-Electron Transport in Ultraintense-Laser-Produced Plasmas. Physical Review Letters. 99(11). 115003–115003. 9 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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