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Information Directory

Reference Directory

Exempt Quantities

Federal regulatory authorities consider certain quantities of radioactive materials to be exempt from regulatory authority. In other words, one may possess up to the specified amount of a particular radionuclide without having to secure a radioactive materials license.  However, this exemption does not apply to quantities that may be commercially distributed. (Press the “Position Papers” category in the “References and Resources” section above to review several USNRC position papers on this topic.)

The following is the listing of exempt quantities, in units of “microcuries”, promulgated by the U. S. Nuclear Regulatory Commission in Title 10, Code of Federal Regulations, Part 30. Agreement States may have additional requirements for the use of these materials or interpret these regulations in a different manner.  Please contact Plexus-NSD for guidance on state-specific requirements.

Antimony

  • Sb-122 – 100
  • Sb-124 – 10
  • Sb-125 – 10

Arsenic

  • As-73 – 100
  • As-74 – 10
  • As-76 – 10
  • As-77 – 100

Barium

  • Ba-131 – 10
  • Ba-133 – 10
  • Ba-140 – 10

Bismuth

  • Bi-210 – 1

Bromine

  • Br-82 – 10

Cadmium

  • Cd-109 – 10
  • Cd-115m – 10
  • Cd-115 – 100

Calcium

  • Ca- 45 – 10
  • Ca- 47 – 10

Carbon

  • C-14 – 100

Cerium

  • Ce-141 – 100
  • Ce-143 – 100
  • Ce-144 – 1

Cesium

  • Cs-131 – 1,000
  • Cs-134m – 100
  • Cs-134 – 1
  • Cs-135 – 10
  • Cs-136 – 10
  • Cs-137 – 10

Chlorine

  • C1-36 – 10
  • Cl-38 – 10

Chromium

  • Cr-51 – 1,000

Cobalt

  • Co-57 – 100
  • Co-58m – 10
  • Co-58 – 10
  • Co-60 – 1

Copper

  • Cu-64 – 100

Dysprosium

  • Dy-165 – 10
  • Dy-166 – 100

Erbium

  • Er-169 – 100
  • Er-171 – 100

Europium

  • Eu-152 – 9.2 h – 100
  • Eu-152 – 13 yr – 1
  • Eu-154 – 1
  • Eu-155 – 10

Fluorine

  • F-18 – 1,000

Gadolinium

  • Gd-153 – 10
  • Gd-159 – 100

Gallium

  • Ga-72 – 10

Germanium

  • Ge-71 – 100

Gold

  • Au-198 – 100
  • Au-199 – 100

Hafnium

  • Hf-181 – 10

Holmium

  • Ho-166 – 100

Hydrogen

  • H-3 (tritium) – 1,000

Indium

  • In-113m – 100
  • In-114m – 10
  • In-115m – 100
  • In-115 – 10

Iodine

  • I-125 – 1
  • I-126 – 1
  • I-129 – 0.1
  • I-131 – 1
  • I-132 – 10
  • I-133 – 1
  • I-134 – 10
  • I-135 – 10

Iridium

  • Ir-192 – 10
  • Ir-194 – 100

Iron

  • Fe-55 – 100
  • Fe-59 – 10

Krypton

  • Kr-85 – 100
  • Kr-87 – 10

Lanthanum

  • Lu-140 – 10

Lutetium

  • La-177 – 100

Manganese

  • Mn-52 – 10
  • Mn-54 – 10
  • Mn-56 – 10

Mercury

  • Hg-197m – 100
  • Hg-197 – 100
  • Hg-203 – 10

Molybdenum

  • Mo-99 – 100

Neodynium

  • Nd-147 – 100
  • Nd-149 – 100

Nickel

  • Ni-59 – 100
  • Ni-63 – 10
  • Ni-65 – 100

Niobium

  • Nb-93m – 10
  • Nb-95 – 10
  • Nb-97 – 10

Osmium

  • Os-185 – 10
  • Os-191m – 100
  • Os-191 – 100
  • Os-193 – 100

Palladium

  • Pd-103 – 100
  • Pd-109 – 100

Phosphorus

  • P-32 – 10

Platinum

  • Pt-191 – 100
  • Pt-193m – 100
  • Pt-193 – 100
  • Pt-197m – 100
  • Pt-197 – 100

Polonium

  • Po-210 – 0.1

Potassium

  • K-42 – 10

Praseodymium

  • Pr-142 – 100
  • Pr-143 – 100

Promethium

  • Pm-147 – 10
  • Pm-149 – 10

Rhenium

  • Re-186 – 100
  • Re-188 – 100

Rhodium

  • Rh-103m – 100
  • Rh-105 – 100

Rubidium

  • Rb-86 – 10
  • Rb-87 – 10

Ruthenium

  • Ru-97 – 100
  • Ru-103 – 10
  • Ru-105 – 10
  • Ru-106 – 1

Samarium

  • Sm-151 – 10
  • Sm-153 – 100

Scandium

  • Sc-46 – 10
  • Sc-47 – 100
  • Sc-48 – 10

Selenium

  • Se-75 – 10

Silicon

  • Si-31 – 100

Silver

  • Ag-105 – 10
  • Ag-110m – 1
  • Ag 111 – 100

Sodium

  • Na-24 – 10

Strontium

  • Sr-85 – 10
  • Sr-89 – 1
  • Sr-90 – 0.1
  • Sr-91 – 10
  • Sr-92 – 10

Sulphur

  • S-35 – 100

Tantalum

  • Ta-182 – 10

Technetium

  • Tc-97m – 100
  • Tc-97 – 100
  • Tc-99m – 100
  • Tc-99 – 10

Tellurium

  • Te-125m – 10
  • Te-127m – 10
  • Te-127 – 100
  • Te-129m – 10
  • Te-129 – 100
  • Te-131m – 10
  • Te-132 – 10

Terbium

  • Tb-160 – 10

Thallium

  • T- 200 – 100
  • Tl-201 – 100
  • Tl-202 – 100
  • Tl-204 – 10

Thulium

  • Tm-170 – 10
  • Tm-171 – 10

Tin

  • Sn-113 – 10
  • Sn-125 – 10

Tungsten

  • W-181 – 10
  • W-185 – 10
  • W-187 – 100

Vanadium

  • V-48 – 10

Xenon

  • Xe-131m – 1,000
  • Xe-133 – 100
  • Xe-135 – 100

Ytterbium

  • Yb-175 – 100

Yttrium

  • Y 90 – 10
  • Y 91 – 10
  • Y 92 – 100
  • Y 93 – 100

Zinc

  • Zn-65 – 10
  • Zn-69m – 100
  • Zn-69 – 1,000

Zirconium

  • Zr-93 – 10
  • Zr-95 – 10
  • Zr-97 – 10

All others except alpha-emitting byproduct material – 0.1

Alpha-emitting byproduct material – 0