response checks of portable radiation detection instruments
TRANSCRIPT
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Response Checks of PortableRadiation Detection Instruments
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Enabling Objectives
Name Instrument Control Procedure
State Calibration Organization
State Frequency of Response Checks
Identify Response Check Equipment
Identify Shepherd Components
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Enabling Objectives
State Isotopes & Activity for Shepherd Sources
Identify Response Window Criteria Identify Instruments Response
Checked with Plutonium State Purpose of Scintrex Model
309A
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Instrumentation Controls
“Radiological Instrument/ Equipment Controls”
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Instrument Calibration
Portable Radiation Detection Instruments Calibrated by:
Environmental RadiologicalMonitoring & Instrumentation (ERM&I)
Western Area Radiological Laboratory,(WARL) Muscle Shoals, AL
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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
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Response Checks ofBeta-Gamma Dose Instruments
Shepherd Model 89 Irradiator
- Source Rod Assembly
- Shielded Calibration Range
Assembly
- Attenuator Assembly
- Table Assembly
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Shepherd Source Rod Assembly
Cs-137130 mCi400 Ci
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Shepherd Shielded Calibration Range Assembly
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Shepherd Attenuator Assembly
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Shepherd Table Assembly
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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
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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
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Establishing Response Windows
Expose at Least Four Instruments
Exposure Values Near Midscale
Set Window for Each Scale
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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
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Instrument Pre-Operational Checks
Inspect for Damage Inspect Switches, Alarms, Controls Inspect Cables & Power Cords Check Battery Strength Instrument in Calibration
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Performing Response Checks with Shepherd Irradiator
Position Instrument on Guide
- Beta Gamma Survey Meter
- Teletector
- Electronic Dosimeter
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Beta-Gamma Survey Meter
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Teletector
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Electronic Dosimeter
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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
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Observation Window
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Response Check of AlphaSurvey 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
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Alpha Survey Instrument
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Neutron Survey Instrument
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Response Check ofNeutron Instruments
Set up the Instrument Scale Instrument Over Neutron Source Check Other Scales/Decades with
Pulse Generator Compare Results with Response
Log Document Results
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Frisker
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Response Check ofFriskers
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
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Tritium in Air Monitor
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Response Check ofScintrex Model 309A
Inspect Filter Paper Ensure Battery >3.0 volts Set Function Switch to ‘Display On’ Press ‘Test’ Button Observe Display < 50
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Response Check ofScintrex Model 309A
Position Gamma Source on Right Side
Wait 1-2 Minutes Observe Reading Between 8 & 24 Depress ‘Test’ Button Document Results
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Summary Instrument Calibration Critical Response Checks Confirm Operation Shepherd Model 89 Irradiator Other Response Checks:
- Alpha Survey Instruments- Neutron Instruments- Friskers- Tritium-in-Air
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Prevent Errors -Reduce Contamination