Californium-252 Neutron Source
Californium-252 sealed sources emit neutrons for industrial applications like moisture gauging and reactor startup. Classified under HTS 2844.43.00.21 as it contains the specifically listed isotope californium-252. These are chemically defined radioactive isotopes per Chapter 28 notes.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If assembled into complete X-ray apparatus
When incorporated into finished X-ray generators or tube assemblies, classifies under Chapter 90 apparatus.
If for non-listed isotopes like cobalt-60
Only specific isotopes in 2844.43; common isotopes like Co-60 go to residual 2844.40.
If doped into semiconductor wafers
Doped electronic materials in wafer/disc form shift to Chapter 85 semiconductors per Chapter Note 8.
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Import Tips & Compliance
• File NRC Form 741 at least 7 days before import; high specific activity requires Type B packaging
• Include dosimetry reports and decay chain analysis in import documentation
• Confirm exemption from other chapters via specific activity >74 Bq/g documentation
Related Products under HTS 2844.43.00.21
Americium-241 Oxide
Americium-241 oxide is a radioactive compound used primarily in smoke detectors and as a calibration source for gamma spectroscopy. It falls under HTS 2844.43.00.21 as a chemically defined compound of the specified radioactive isotope Americium-241. This subheading covers specific listed radioactive elements, isotopes, and their compounds.
Cesium-137 Sealed Source
Cesium-137 sealed irradiators used for blood irradiation and calibration standards in nuclear medicine. Falls under HTS 2844.43.00.21 as a compound of the listed radioactive isotope cesium-137. Meets Chapter 28 definition for radioactive isotopes and their compounds.
Gadolinium-153 Calibration Source
Gadolinium-153 sources for calibrating bone density scanners and PET/SPECT systems. Classified in HTS 2844.43.00.21 as it contains the named isotope gadolinium-153 in oxide form. Chapter notes confirm radioactive isotopes coverage.
Iridium-192 Industrial Radiography Source
Iridium-192 wire sources for non-destructive weld testing in pipeline and aerospace manufacturing. HTS 2844.43.00.21 applies to this listed metallic isotope used in sealed capsules. Qualifies as chemically defined radioactive element per subheading note.
Promethium-147 Beta Source
Promethium-147 used in thickness gauges for paper/plastic film manufacturing. Falls under HTS 2844.43.00.21 as chemically defined compound of listed rare earth isotope. Chapter 28 note 4 explicitly covers promethium.
Radium-226 Calibration Standard
Radium-226 reference sources for alpha spectrometry calibration in environmental labs. Classified HTS 2844.43.00.21 as listed naturally occurring radioactive isotope. Maintains Chapter 28 classification despite alpha decay products.