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[ Technical Notes > How Much Dust and Meteoritic Debris Should the Moon Have If It Is 4,600,000,000 Years Old? > Integration ]

Integration

The general form of the cumulative flux curves is

log N = a + b log m

which is equivalent to

technicalnoteszz-moon_dust03.jpg Image Thumbnail

where n(m) is the distribution function of the number of particles of size m.

Differentiating both sides of the right equation above with respect to m gives

                                    10a (b) mb-1  =  -n

Multiplying the number of particles (n) in a narrow mass range (dm) by the mass m and then integrating between m1 and m2 gives the total mass within that size range  [m1 – m2] that accumulates per square meter per second.

technicalnoteszz-moon_dust04.jpg Image Thumbnail

Within this mass range, the thickness (t) of pulverized meteoritic material that will accumulate on the Moon’s surface in 4.6 × 109 years, if the influx has always been at today’s rate, is

technicalnoteszz-moon_dust05.jpg Image Thumbnail

where

technicalnoteszz-moon_dust06.jpg Image Thumbnail

and the density of the pulverized lunar crust is 2 gm/cm3.

The total thickness of meteoritic material and pulverized Moon rock during 4.6 × 109 years is

     (tA + tB + tC + tD) 67

where 67 is the ratio of the pulverized Moon rocks to meteoritic material. Table 42 gives the calculated values for the various thicknesses.

Table 42. Computed Thickness of Lunar Dust

Region

a

b

Mass Range
(gm)

67 × tA–D
(meters)

A

-10.08

-0.55

10-13 to 10-6

0.98

B

-14.77

-1.33

10-6 to 102

3.17

C

-15.12

-1.16

102 to 106

0.01

D

-18.91

-0.53

106 to 2.71 × 1018

310.86

                                             Total Thickness =

       315 . 02 m

We will disregard debris contributed by the region to the right of Point E.

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