X-ray absorbing material

Lead

Interspacer material

Aluminium

Thickness of lead strips

N30 (30 lines/cm) 0.05 mm

N40 (40 lines/cm) 0.04 mm

N70 (70 lines/cm) 0.036 mm

Cover material

0.20 mm Aluminium (0.20 mm on one side of N70 grids R 6 and R 8 or 0.25 mm Carbon Fibre Resin (CFR)

Weight and thickness

-

N30 Grids

Parallel

 Focused

Ratio

 6

8

8

10

Weight

G/SQ CM

0.83

1.04

2.75

1.22

Thickness

MM

2.25

2.75

1.04

3.25

N40 Grids

Parallel

Focused

Ratio

 6

8

10

6

8

10

12

Weight

G/SQ/CM

0.65

0.8

0.95

0.6

0.8

0.95

1.12

Thickness

MM

1.8

2.15

2.55

1.8

2.15

2.55

2.95

N70 Grids

Parallel

Focused

Ratio

 6

8

10

12

16

Weight

G/SQ/CM

0.45

0.55

0.66

0.75

0.97

Thickness

MM

1.2

1.4

1.55

1.75

2.2

FOCUSED GRIDS

Ratio 8:1

Ratio 10:1

Ratio 12:1

Width

Focused on f₀

Focused on f₀

Focused on f₀

80 cm
31 in.

105 cm
41 in.

180 cm
72 in.

80 cm
31 in.

105 cm
41 in.

180 cm
72 in.

80 cm
31 in.

105 cm
41 in.

180 cm
72 in.

cm

18
24
30
35
43

cm
f₁ - f₂
55-143
60-119
63-109
65-104
67-98

cm
f₁ - f₂
66-250
73-187
77-162
81-150
84-139

cm
f₁ - f₂
90- -
103-720
112-450
119-370
127-310

cm
f₁ - f₂
59-123
63-110
66-101
68-98
70-94

cm
f₁ - f₂
71-198
78-162
82-146
85-138
88-130

cm
f₁ - f₂
100-900
112-450
122-346
128-305
135-269

cm
f₁ - f₂
61-114
66-102
68-97
69-94
71-91

cm
f₁ - f₂
76-172
81-148
85-136
87-131
90-125

cm
f₁ - f₂
108-545
120-360
129-300
134-273
141-250

inches
7
10
12
14
17

inches
22-57
24-47
25-43
26-42
27-39

inches
26-100
29-75
31-65
32-60
34-56

inches
36- -
41-288
45-180
48-148
51-124

inches
24-49
25-44
26-40
27-39
28-38

inches
28-79
31-65
33-58
34-55
35-52

inches
40-360
45-180
49-138
51-122
54-108

inches
24-46
26-41
27-39
28-38
28-36

inches
30-69
32-59
34-54
35-52
36-50

inches
43-218
48-144
52-120
54-109
56-100