1. Response Checks of Portable Radiation Detection Instruments

2. Enabling Objectives Name Instrument Control Procedure
State Calibration Organization
State Frequency of Response Checks
Identify Response Check Equipment
Identify Shepherd Components

3. Enabling Objectives State Isotopes & Activity for Shepherd Sources
Identify Response Window Criteria
Identify Instruments Response Checked with Plutonium
State Purpose of Scintrex Model 309A

4. Instrumentation Controls
“Radiological Instrument/ Equipment Controls”

5. Instrument Calibration
Portable Radiation Detection Instruments Calibrated by: Environmental Radiological Monitoring & Instrumentation (ERM&I) Western Area Radiological Laboratory, (WARL) Muscle Shoals, AL

6. Response Check Frequency
Teletector & RSO-7 Daily
Beta-Gamma Instruments Weekly
Alpha & Beta Friskers Weekly
Neutron Dose Instruments Weekly
On-Site REP Instruments Weekly
Electronic Dosimeters Quarterly

7. Response Checks of Beta-Gamma Dose Instruments
Shepherd Model 89 Irradiator - Source Rod Assembly - Shielded Calibration Range Assembly - Attenuator Assembly - Table Assembly

8. Shepherd Source Rod Assembly Cs-137 130 mCi 400 Ci

9. Shepherd Shielded Calibration Range Assembly

10. Shepherd Attenuator Assembly

11. Shepherd Table Assembly

12. Shepherd Precautions Plugs in Unused Access Ports
Hands & Fingers Clear of Door
Never Lubricate Source Rod
Don’t Twist Attenuator Handles
Move Table Slowly
Utilize Survey Meter

13. Shepherd Performance Checks
Test the Interlock System - Attempt to Raise Source or Open Door with Power Off - Attempt to Raise Source with Door Open - Attempt to Open Door with Source Raised

14. Establishing Response Windows
Expose at Least Four Instruments
Exposure Values Near Midscale
Set Window for Each Scale

15. Response Window Criteria
Arithmetic Mean of all Instruments
Calculate Highest Percent Difference
Calculate Lowest Percent Difference
Discard Highest or Lowest Percent Difference if Exceed 10 Percent
Response Window = Mean ± 20 %
Expressed as Range

16. Instrument Pre-Operational Checks
Inspect for Damage
Inspect Switches, Alarms, Controls
Inspect Cables & Power Cords
Check Battery Strength
Instrument in Calibration

17. Performing Response Checks with Shepherd Irradiator
Position Instrument on Guide - Beta Gamma Survey Meter - Teletector - Electronic Dosimeter

18. Beta-Gamma Survey Meter

19. Teletector

20. Electronic Dosimeter

21. Performing Response Checks with Shepherd Irradiator
Position Attenuators and Platform
Close Door
Raise Source to make Exposure
Lower Source to “Off”
Repeat for Each Scale
Document Results

22. Observation Window

23. Response Check of Alpha Survey Instruments
Alpha Sources, ie Pu-239
Inspect Mylar Windows
Perform Light Test
Expose Detector
Compare Results with Response Log
Check Each Scale or Decade
Document Results

24. Alpha Survey Instrument

25. Neutron Survey Instrument

26. Response Check of Neutron Instruments
Set up the Instrument Scale
Instrument Over Neutron Source
Check Other Scales/Decades with Pulse Generator
Compare Results with Response Log
Document Results

27. Frisker

28. Response Check of Friskers
Sources Identified in Response Log
Set Frisker to Appropriate Range/Scale
Position Probe over Source
Repeat for Other Scales
Compare Results with Response Log
Document Results

29. Tritium in Air Monitor

30. Response Check of Scintrex Model 309A
Inspect Filter Paper
Ensure Battery >3.0 volts
Set Function Switch to ‘Display On’
Press ‘Test’ Button
Observe Display < 50

31. Response Check of Scintrex Model 309A
Position Gamma Source on Right Side
Wait 1-2 Minutes
Observe Reading Between 8 & 24
Depress ‘Test’ Button
Document Results

32. Summary Instrument Calibration Critical
Response Checks Confirm Operation
Shepherd Model 89 Irradiator
Other Response Checks: - Alpha Survey Instruments - Neutron Instruments - Friskers - Tritium-in-Air

33. Prevent Errors - Reduce Contamination