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External in Soil – Infinite Thickness

The following is a listing of external dose conversion factors for radionuclides that are evenly distributed throughout an infinitely thick soil layer. The values shown below are in units of “millirem per year, per microcurie per cubic centimeter” at a height of one (1) meter above the soil surface. They are used to convert soil concentrations into effective dose equivalent.

Actinium

  • Ac-227 – 309.52
  • Ac-228 – 3737600

Americium

  • Am-240 – 3877760
  • Am-241 – 28382.4

Barium

  • Ba-133 – 1238080
  • Ba-133m – 170528

Beryllium

  • Be-7 – 179872
  • Be-10 – 672.768

Bismuth

  • Bi-210m – 860816
  • Bi-210 – 2254.24
  • Bi-212 – 732336
  • Bi-214 – 6132000

Cadmium

  • Cd-107 – 31185.6
  • Cd-109 – 9192.16

Californium

  • Cf-250 – 74.0512
  • Cf-252 – 109.9088
  • Cf-254 – 0.241776

Carbon

  • C-11 – 3749280
  • C-14 – 8.4096

Cerium

  • Ce-141 – 198560
  • Ce-143 – 926224
  • Ce-144 – 44851.2

Cesium

  • Cs-134 – 5921760
  • Cs-136 – 8316160
  • Cs-137 – 469.536

Chromium

  • Cr-48 – 1389920
  • Cr-49 – 3749280
  • Cr-51 – 109091.2

Cobalt

  • Co-57 – 313024
  • Co-58 – 3725920
  • Co-60 – 10138240

Copper

  • Cu-64 – 699632
  • Cu-66 – 353904

Curium

  • Cm-240 – 98.2288
  • Cm-242 – 106.872
  • Cm-244 – 78.7232

Europium

  • Eu-152 – 4380000
  • Eu-154 – 4800480

Galium

  • Ga-66 – 10313440
  • Ga-67 – 463696

Gold

  • Au-198 – 1448320
  • Au-199 – 244112

Indium

  • In-109 – 2417760
  • In-110 – 11680000

Iodine

  • I-125 – 10348.48
  • I-126 – 1646880
  • I-128 – 315360
  • I-129 – 8094.24
  • I-130 – 8082560
  • I-131 – 1354880

Iridium

  • Ir-190m – 5489600
  • Ir-190 – 5069120
  • Ir-192 – 469536
  • Ir-194 – 342224
  • Ir-195 – 102667.2

Iron

  • Fe-59 – 4777120
  • Fe-60 – 7.008

Lead

  • Pb-210 – 1530.08
  • Pb-211 – 191552
  • Pb-212 – 440336
  • Pb-214 – 838624

Manganese

  • Mn-52 – 13665600
  • Mn-54 – 3223680

Mercury

  • Hg-195 – 621376
  • Hg-197m – 220752
  • Hg-197 – 107456

Molybdenum

  • Mo-90 – 2884960
  • Mo-99 – 554800

Nickel

  • Ni-56 – 6447360
  • Ni-57 – 7743840
  • Ni-65 – 2242560
  • Ni-66 – 23.7104

Niobium

  • Nb-94 – 6050240
  • Nb-95m – 199728
  • Nb-95 – 2931680

Osmium

  • Os-180 – 99980.8
  • Os-181 – 4496800
  • Os-185 – 2604640

Phosphorus

  • P-32 – 7370.08

Plutonium

  • Pu-238 – 94.608
  • Pu-239 – 184.544
  • Pu-240 – 91.688
  • Pu-241 – 3.69088

Polonium

  • Po-210 – 24.2944
  • Po-212 – 0
  • Po-214 – 321.2
  • Po-216 – 65.1744

Potassum

  • K-40 – 650576
  • K-42 – 1179680

Protactinium

  • Pa-233 – 637728
  • Pa-234m – 56064
  • Pa-234 – 7218240

Radium

  • Ra-224 – 32003.2
  • Ra-226 – 19856
  • Ra-228 – 0

Radon

  • Rn-220 – 1436.64
  • Rn-222 – 1471.68

Rubidium

  • Rb-79 – 4940640
  • Rb-81 – 2195840
  • Rb-83 – 1833760
  • Rb-84 – 3504000
  • Rb-86 – 383104
  • Rb-87 – 88.0672
  • Rb-88 – 2733120
  • Rb-89 – 8549760

Silver

  • Ag-110m – 10733920
  • Ag-110 – 140160

Sodium

  • Na-22 – 8549760
  • Na-24 – 17753600

Strontium

  • Sr-85 – 1857120
  • Sr-89 – 5676.48
  • Sr-90 – 440.336
  • Sr-91 – 2721440

Tantalum

  • Ta-185 – 539616
  • Ta-186 – 5629760

Technetium

  • Tc-99m – 34456
  • Tc-99 – 78.4896

Thallium

  • Tl-201 – 172864
  • Tl-202 – 1565120
  • Tl-208 – 14366400

Thorium

  • Th-228 – 4964
  • Th-230 – 748.688
  • Th-232 – 325.872

Uranium

  • U-230 – 2733.12
  • U-232 – 564.144
  • U-233 – 873.664
  • U-234 – 251.12
  • U-235 – 450848
  • U-238 – 64.4736
  • U-240 – 890.016

Yttrium

  • Y-90 – 14950.4
  • Y-91 – 20323.2

Zinc

  • Zn-65 – 2312640

Zirconium

  • Zr-89 – 4461760
  • Zr-95 – 2826560