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Understanding Radiochemistry Testing and The 2016 TNI Standard - EPA Method 901.1 Gamma Spectrometry


This course will provide participants with a general understanding of the theory behind the radioanalytical techniques used to perform gamma spectrometric measurements as outlined in EPA method 901.1 (Gamma Emitting Radionuclides in Drinking Water) and supported by references such as ANSI N42.14-2004 (“Calibrations and Use of Germanium Spectrometers for the Measurement of Gamma-Ray Emission Rates of Radionuclides”) and ASTM D7282-06 (“Standard Practice for Set-up, Calibration, and Quality Control of Instruments Used for Radioactivity Measurements”). A mixture of lecture and interactive exercises using real laboratory data examples will help participants understand how analytical processes translate into actions, results, and records that one might encounter in a typical radioanalytical laboratory. It will also address typical challenges that may be encountered. This class will be of benefit both to radiochemistry laboratorians and radiochemistry assessors.

Expected Learning Outcomes:  
Students will complete the course with an understanding of:

  • The general principles behind gamma spectrometry:
    • Radioactive decay and decay modes;
    • Fundamental Interactions of gamma rays;
    • Basic features of a gamma ray spectrum;
    • Gamma spectrometry equipment;
    • Importance of process knowledge;
    • Decay correction as it applies to gamma spectrometry;
    • Types of equilibrium important in gamma spectrometry;
    • Preparation of the sample test source;
    • Set-up, quality control and calibration requirements for gamma spectrometers;
    • Background determinations for gamma spectrometers.
    • A general familiarity with the calculations of activity concentrations.
  • And how V1M6 requirements relate to the:
    • Uncertainty and detection capability;
    • Calibration life cycle: Instrument set-up, calibration, and performance checks;
    • Sample specific controls:
    • Sample measurements;
    • Batch quality controls;
    • Reviewing and reporting results.

CEUs: 0.75

Course Fee:
$195 for TNI members and $220 for non-members; $595 group rate for 5 or more students.

TNI Members: you must be logged-in to the website to receive the member rate.

About Webcasts:
 Upon receipt of your payment, you will receive a special link by e-mail to watch the webcast on your computer. The link is time-limited: you will have full access to the webcast and any associated handouts for 6 months after receipt of payment, at which time the link will expire. Webcasts cannot be downloaded; they are intended for viewing on your computer only during the 6-month window. If you have any questions, please contact Ilona Taunton at

No certificates are provided with webcasts. An additional $15 per person will be charged for anyone who desires a Certificate of Attendance (CoA) or Certificate of Completion (CoC) for the course. A passing score of 2/3 must be received on the Quiz in order to receive CEUs and a CoC. Contact Ilona Taunton at and provide a copy of your course receipt, date of course completion after you have completed the class and copy of your completed quiz.

Group rates are available: Each purchased webcast is to be viewed by only one student. If you would like multiple viewers, separate purchases must be made. A group rate of $595 is available for groups of 5 or more students at a single location. Click hereto purchase this webcast at the group rate.


6.5 hours

This course has been reviewed and approved by TNI.

Presented By:

TNI Radiochemistry Expert Committee

About the Presenter:
The mission of this committee is to maintain the radiochemistry standard (TNI Environmental Sector Volume 1, Module 6) based on public input; to provide technical assistance on issues related to radiochemistry; and, to develop tools that facilitate the implementation of the standard.