Potential Doses to Individuals Screened with Whole-Body Security Screening Systems: OSL Dosimeter Measurements Craig R. Jones, CHP Fran Szrom, CHP UNCLASSIFIED June 2011

2 UNCLASSIFIED Disclaimer The appearance of a manufacturers equipment does not imply endorsement of the equipment by the Army, DOD, or the Federal Government.

Individual Screened –General-Use: 0.25 μSv (25 μrem) per screening –Limited-Use: 0.01 mSv (1 mrem) per screening –0.25 mSv (25 mrem) per year Operators/Bystanders Annual Limit – 1 mSv (100 mrem) per year Inspection zone – operators and bystanders outside inspection zone during screening Introduction to Personnel Security Screening Systems 3 UNCLASSIFIED

Purpose: Evaluate potential dose to the individual being screened Field measurements – ANSI N methodology (Reference Effective Dose) Energy correction, Dose conversion factors – No estimate of eye or skin doses with survey instruments Dosimeter study requires – Very large number of screenings – Automated method for initiating screenings – Using DDE as a surrogate for Reference Effective Dose 4 UNCLASSIFIED Background

Test Setup – Repetitive Screening 5 UNCLASSIFIED System 1: –Robotic solution –93,105 screenings –~ 2 weeks System 2: –Software solution –8,627 screenings –< 1 week

Test Setup - Phantoms 6 UNCLASSIFIED

Maximum DDE per screening: – 4,200 μSv/93,105 screenings = μSv (4.5 μrem) Average DDE per screening: – 3,559 μSv/93,105 screenings = μSv (3.8 μrem) Minimum DDE per screening: – 2,560 μSv/93,105 screenings = μSv (2.7 μrem) 7 UNCLASSIFIED System 1: Deep Dose Equivalent Screenings to Reach 0.25 mSv (25 mrem) AnnualWeeklyDaily Max DDE5, Avg DDE6, Min DDE9,

Maximum LDE per screening: – 8,450 μSv/93,105 screenings = μSv (9.1 μrem) Average LDE per screening: – 6,226 μSv/93,105 screenings = μSv (6.7 μrem) Minimum LDE per screening: – 4,710 μSv/93,105 screenings = μSv (5.1 μrem) 8 UNCLASSIFIED System 1: Lens Dose Equivalent Screenings to Reach 15 mSv (1500 mrem) AnnualWeeklyDaily Max LDE165,2753, Avg LDE224,3294, Min LDE296,5135,702815

Maximum SDE per screening: – 15,050 μSv/93,105 screenings = μSv (16.2 μrem) Average SDE per screening: – 10,552 μSv/93,105 screenings = μSv (11.3 μrem) Minimum SDE per screening: – 7,420 μSv/93,105 screenings = μSv (8.0 μrem) 9 UNCLASSIFIED System 1: Shallow Dose Equivalent Screenings to Reach 50 mSv (5 rem) AnnualWeeklyDaily Max SDE309,3195, Avg SDE441,1638,4841,212 Min SDE627,39212,0651,724

System 2 10 UNCLASSIFIED

Maximum DDE per screening: – 540 μSv/8,627 screenings = μSv (6.3 μrem) Average DDE per screening: – 416 μSv/8,627 screenings = μSv (4.8 μrem) Minimum DDE per screening: – 250 μSv/8,627 screenings = μSv (2.9 μrem) 11 UNCLASSIFIED System 2: Deep Dose Equivalent Screenings to Reach 0.25 mSv (25 mrem) AnnualWeeklyDaily Max DDE3, Avg DDE5, Min DDE8,

Maximum LDE per screening: – 650 μSv/8,627 screenings = μSv (7.5 μrem) Average LDE per screening: – 516 μSv/8,627 screenings = μSv (6.0 μrem) Minimum LDE per screening: – 280 μSv/8,627 screenings = μSv (3.3 μrem) 12 UNCLASSIFIED System 2: Lens Dose Equivalent Screenings to Reach 15 mSv (1500 mrem) AnnualWeeklyDaily Max LDE199,0853, Avg LDE250,7854, Min LDE462,1618,8881,270

Maximum SDE per screening: – 780 μSv/8,627 screenings = μSv (9.0 μrem) Average SDE per screening: – 577 μSv/8,627 screenings = μSv (6.7 μrem) Minimum SDE per screening: – 280 μSv/8,627 screenings = μSv (3.3 μrem) 13 UNCLASSIFIED System 2: Shallow Dose Equivalent Screenings to Reach 50 mSv (5 rem) AnnualWeeklyDaily Max SDE553,01310,6351,519 Avg SDE747,57414,3762,054 Min SDE1,540,53629,6264,232

Both systems evaluated comply with the ANSI/HPS N dose per screening limit for general-use DDE is comparable to the Reference Effective Dose (ANSI/HPS N ) The annual number of screenings per individual is limited by the DDE/Reference Effective Dose, not LDE or SDE. 14 UNCLASSIFIED Summary Dose per Screening ( μ Sv ( μ rem)) Avg DDERef Eff Dose System (3.8)0.033 (3.3) System (4.8)0.046 (4.6)