Using Synchrotron-Based X-Ray Microcomputed Tomography to Characterize Water Distribution in Compacted Soils

Table 1

Main parameters of recent X-ray μ-CT tests on soils in the literature.

X-ray sources	Detector			Projection			Sample size		Reference
	Pixel size (μm)	No. of pixels	Field of view (mm)	Exposure time (s)	No. of projections	Total acquisition time (min)	D (mm)	H (mm)
X-ray tube	11.2	2316 × 2316	25.9 × 25.9	2	1000	/	10	23	[8]
	75.7		77.5 × 77.5	0.5; 2.4	1200	20; 240	35	70	[19]
	7.6	1024 × 1024	7.8 × 7.8		4800
	4.2		4.3 × 4.3		4800
	9	4008 × 2672	36 × 24	0.2	1440	90	50	10	[12]
	127	1920 × 1526	244 × 194
	3.3	2000 × 2000	6.6 × 6.6	/	/	90	/	/	[27]
Synchrotron radiation	14	2048 × 2048	28.7 × 28.7	0.08	1200	5	10	20	[38]
		1024 × 1024	14.3 × 14.3	0.04		2.5	20	40
	14	/	/	/	/	12	11	22	[17]
	2.2	4008 × 2672	8.8 × 5.9	2	3600	120	/	/	[39]
	7.5	2680 × 1300	20.1 × 9.75	1.8–2.2	/	180–240	8	4	[40]
	4.4	/	/	/	1440	60–90	3 × 4 × 5		[41]
	0.33	/	0.8 × 0.6	0.09	1501	/	0.5	/	[42]
	0.5	/	/	0.3	1500	/	<1	<1	[43]