手法を比較

	X線密度測定法	ヤンカ硬度
分野	林学	林学
系統	Process / pipeline	Process / pipeline
提唱年	2005	1934
提唱者	Gabriel Gazo	Gabriel Janka
種類	measurement method	hardness test
原典	Hansmann, C., Wimmer, R., & Gindl, W. (2007). Assessing damage in wood-polymer composites by depth-sensing indentation. Composites Part A, 38(6), 1502–1508.	ASTM D1037-21. (2021). Standard test methods for evaluating properties of wood-base fiber and particle panel materials. ASTM International.
別名	wood density, radiography	wood hardness, resistance to indentation
関連	3	3
概要	X-ray densitometry is a nondestructive method for measuring wood density, microdensity profiles, and ring-by-ring density variation in wood samples using X-ray image analysis. The method uses attenuation of X-rays passing through wood to quantify mass per unit volume. It enables rapid assessment of wood quality without destroying material, making it valuable for research, timber grading, and genetic selection programs.	The Janka hardness test measures wood resistance to indentation and denting by forcing a steel ball into the wood surface under standard load. Developed by Gabriel Janka in 1934, the test is a simple, nondestructive indicator of wood durability, wear resistance, and suitability for flooring, furniture, and other wear-prone applications. Janka hardness is one of the most widely used wood property metrics in wood science and commerce.