Materials

Isotopes

Weight Fraction

Density (g/cm3)

Zones

Material 1

(plutonium metal)

Isotope 1 (239Pu)

9.3804 × 10−1

19.6

Homogeneous sphere of radius r 1 = 3.794 cm , designated as “material 1” and assigned to zone 1

Isotope 2 (240Pu)

5.9411 × 102

Isotope 3 (69Ga)

1.5152 × 10−3

Isotope 4 (71Ga)

1.0346 × 10−3

Material 2

(polyethylene)

Isotope 5 (C)

8.5630 × 10−1

0.95

Homogeneous spherical shell of inner radius r 1 = 3.794 cm and outer radius r 2 = 7.604 cm , designated as “material 2” and assigned to zone 2

Isotope 6 (1H)

1.4370 × 10−1