手法を比較

	中性子放射化分析	モンテカルロ中性子・粒子輸送
分野	原子核物理学	原子核物理学
系統	Process / pipeline	Process / pipeline
提唱年	1936	1949
提唱者	George de Hevesy, Hilde Levi	Nicholas Metropolis, Stanislaw Ulam
種類	analytical measurement technique	probabilistic computational method
原典	Chadwick, J. (1932). Possible Existence of a Neutron. Nature, 129(3252), 312.	Metropolis, N., & Ulam, S. (1949). The Monte Carlo Method. Journal of the American Statistical Association, 44(247), 335–341.
別名	NAA, activation analysis, trace element analysis	Monte Carlo simulation, stochastic transport, particle history method
関連	5	5
概要	Neutron activation analysis (NAA) is an analytical technique for determining elemental composition by bombarding samples with neutrons to produce radioactive isotopes, invented by de Hevesy and Levi in 1936. By measuring decay gamma rays from irradiated samples, NAA quantifies trace and major elements with high sensitivity, specificity, and accuracy without requiring destructive dissolution or complex sample preparation.	Monte Carlo neutron and particle transport is a stochastic simulation method that tracks individual particle histories through matter, developed by Metropolis and Ulam in 1949 during the Manhattan Project. By sampling random numbers to determine collision locations, energy transfers, and scattering angles, it produces unbiased estimates of reaction rates, flux distributions, and detector responses without discretizing angle or energy variables.