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Occupational Internal Dosimetry Online Training

Online continuing education course for health physics professionals engaged in internal radiation dose measurement


Personnel working with unencapsulated radioactive materials have the potential to receive internal doses via inhalation or ingestion. Recent experience involving the intake of alpha emitters at nuclear power plants has created a need for individuals who understand the current methods for determining radiation dose from such intakes.

The American Academy of Health Physics grants 40 Continuing Education Credits for completion of this course.

Course description

The Occupational Internal Dosimetry online training course contains 21 modules and four problem sets designed to provide course participants with a thorough understanding of current methods for determining radiation doses resulting from intakes of radioactive materials by workers. The course covers the basic concepts and principles of internal dose assessments, and describes the ICRP internal dosimetry systems and models currently in use in the United States and internationally. Bioassay methods (both direct and indirect) are reviewed and bioassay interpretation is discussed in detail. Regulations and regulatory guidance is discussed, including the design of bioassay programs and methods for demonstrating regulatory compliance. Finally, quality assurance and methods for program evaluation are covered. Throughout the course, students work detailed example problems covering all aspects of internal dose assessment.

A list of the modules included in the course is provided below along with instructions about the registration process. This course is the equivalent of taking the one-week instructor-led course at the PTP training facility. PTP instructors will be available via email, phone, or Microsoft Teams to answer questions and provide assistance when needed.

Target audience

This course is designed for individuals who currently have or anticipate having the responsibility to implement, manage, or evaluate occupational internal dosimetry programs. Participants should be familiar with basic concepts and radiation quantities and units.


$1,995 – Tuition includes access to the course materials via the ORAU Learning Management System (LMS).

Register now


If you have additional questions about this course, please contact the Registrar.

Impact Areas

Registration Information

These are asynchronous (self-paced) online courses. The training staff recommends that you complete the training within six months of enrollment. Once registration is complete, you will receive an email confirming that your registration has been received. Once your payment has been confirmed, you will receive an email containing your user name and temporary password if this is the first time you have registered for an online course. If you have registered before, you will receive notification that the course is now available.

Each course contains a series of modules/exercises to be completed. When all modules are complete, you will be granted access to the exam. A passing score is 70 out of 100. You will have three attempts to successfully complete the exam. Upon successful completion of the exam, a course certificate of completion will be provided.

Please read the following carefully and in its entirety. You must accept these terms and conditions in order to be successfully enrolled in the online course. By accepting these terms and conditions, you are legally obligated to act in accordance with this agreement.

Restricted Materials Use Agreement

By registering for this course offered by Oak Ridge Associated Universities (ORAU), I understand that I will be provided with ORAU PTP course materials developed by ORAU. In exchange for receiving these materials, I agree and understand that the ORAU PTP course materials (both electronic and hardcopy) are provided for use by the registered participant only. Duplication and/or distribution of the course materials, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, is strictly prohibited without the prior written permission of ORAU. The participant may retain and use the course materials for personal reference in perpetuity. Publications and other copyrighted materials provided during the course may be subject to additional restrictions as noted within these documents.

Cancellations and Refunds

Once access to the course material (LMS) has been granted, no refunds or cancellations will be accepted.

Links to Third Party Websites

PTP's Online Training may include links to third party websites that are controlled and maintained by other organizations. Any link to third-party websites is not an endorsement of said websites and ORAU is not responsible for the content or availability of any such sites.


Sessions that contain webinars will be recorded.

  • Module 1: Introduction to Internal Dosimetry I
  • Module 2: Introduction to Internal Dosimetry II
  • Module 3: Introduction to Internal Dosimetry III
  • Module 4: Evolution of Internal Dosimetry Systems
  • Module 5: Modeling Internal Dosimetry
  • Module 6: Intake Models for Inhalation of Radionuclides
  • Module 7: Intake Models for Ingestion of Radionuclides
  • Module 8: Intake Model for Wounds
  • Module 9: Systemic Models
  • Module 10: Dosimetry Models
  • Module 11: Bioassay Programs
  • Module 12: Bioassay Interpretation
  • Module 13: Air Sampling in the Workplace for Internal Dosimetry
  • Module 14: Internal Dosimetry at Nuclear Power Plants
  • Module 15: Internal Dosimetry at Uranium Facilities-Uranium
  • Module 16: Internal Dosimetry at Uranium Facilities-Radon Issues
  • Module 17: Internal Dosimetry at Research and Medical Facilities
  • Module 18: Fetal Dosimetry
  • Module 19: Treatment for Internal Contamination
  • Module 20: NRC Regulations and Guidance for Internal Dosimetry
  • Module 21: Inspection of Internal Dosimetry Programs
  • Problem Set 1
  • Problem Set 2
  • Problem Set 3
  • Problem Set 4

Contact us

For more information about ORAU's Professional Training Programs, contact:

ORAU Professional Training Programs 
P.O. Box 117, MS-11
Oak Ridge, TN 37831-0117
Phone: (865) 576-3576
Fax: (865) 241-9152

ORAU Professional Training Programs flyer

View the PTP course flyer (.PDF, 1.28 MB)