Training Courses

Instrument Repair & Calibration Training


Ludlum Measurements, Inc. offers an intensive two day training course that involves calibration, repair and maintenance on Ludlum manufactured instruments. LMI offers this training at no charge. Accommodations and meals must be provided by the attendees. Training is usually scheduled around middle of the month, but other times can be accommodated especially for groups of four or more. Training is also offered at locations around the country in the Spring and Fall (see list of scheduled classes). If you are interested in signing up for this training, email our training section at This email address is being protected from spambots. You need JavaScript enabled to view it. or call Ludlum Measurements, Inc. at 800-622-0828 toll free or 325-235-5494.

Ludlum Measurements is pleased to announce that the two day training on Instrument Repair and Calibration offered each month in Sweetwater has been granted 32 continuing education credits by the American Academy of Health Physics. The course is assigned ID number 2015-00-028 and applies through calendar year 2018. To view the current schedule for courses offered in Sweetwater, Texas and Knoxville, Tennessee, visit our web page by clicking HERE.

Sweetwater is located 45 miles West of Abilene, Texas on Interstate 20. Abilene is the closest commercial airport. It is served by American Airlines (American Eagle). For accommodations Sweetwater has several motels to offer. [see Restaurant and Lodging attachment].

We encourage your participation in our training program. We have listed a few of the notable organizations that have participated in this program:

  • US Army (several locations)
  • Lockheed Martin (several locations)
  • University of Southern California
  • University of California-Lawrence Berkeley Lab.
  • Merck and Co.
  • Smith Kline Beecham
  • Oak Ridge Associated University
  • Scientific Ecology Group
  • TU Electric
  • FEMA

Training Session Outline

First Day

Detector Basics – DVD
1. G-M Tubes
2. Scintillators
3. Gas Proportional Detectors
4. Ion Chambers
5. Neutron Detectors
Detailed Discussion plus Q and A

Instrument Calibration - Analog Instrument
1. Review of Calibration Certificate and ANSI N323A Requirements
2. Introduction of Calibration Procedure Documents (Working Copy)
3. Electronic Calibration with Pulser
Break for Lunch

Instrument Calibration with Detector
1. Review of Calibration Procedure Documents (Working Copy)
2. Review of Calibration Certificate
3. Calibration Techniques using NIST Traceable Sources
a. Exposure Rate Calibration
b. CPM Calibration and Detector Validation

Detector Operation

1. Fixed HV
2. Sensitivity
3. Dead Time

1. Plateaus Gross Counts and Efficiency  
2. Detector Parameters
a. Efficiencies and Crosstalk


Second Day

Instrument Calibration - Digital Instrument

Review of Calibration Certificate
4. Introduction of Calibration Procedure Documents
   (Working Copy)
5. Electronic Calibration with Pulser

Instrument Calibration with Detector
4. Review of Calibration Procedure Documents (Working Copy)
5. Review of Calibration Certificate
6. Calibration Techniques using NIST Traceable Sources
      a. Exposure Rate Calibration
          Cal Constant and Dead Time Adjustments
      b. CPM Calibration and Detector Validation

7. Detector Operation Gross Counts Scintillator with Instrument and
     a. Plateau
     b. Detector Parameters
     c. Efficiency and Crosstalk
     d. Heel, toe and center testing

8. Detector Operation Peaking for Specific Source   
     a. Example: Cs-137 at 662 keV

Maintenance and Repair

9. Cable testing with Scaler
10. Basic Instrument and Detector Troubleshooting and Repair
    a. Overview of basic repairs and recommended special tools.  
    b. Recommendations / discussion on repair in-house vs return to
    c. Detector Repair
        1. Pancake tube replacement
        2. Scintillator /PMT and window replacement

Break for Lunch

Specific Ludlum Model Operation, Calibration and Minor Repairs as requested.