CLEARVIEW RADIATION SHIELDING TM

Transcription

1 CLEARVIEW RADIATION SHIELDING TM JAYEESH BAKSHI - ALARA ENGINEER RADIUM INCORPORATED, WAYNESBORO, VA JBAKSHI@RADIUMINC.COM; PHONE: (434)

2 BACKGROUND RADIUM PARTNERS WITH MEDICAL AND NUCLEAR FACILITIES CLEARVIEW

3 THE INDUSTRY ISSUE SHIELD DOOR LOCKED HIGH RADIATION AREA Source - MANWAY

4 MATERIAL CHARACTERIZATION RAMAN SPECTROSCOPY * ICP-OES # * Material Science Center Department of Materials Science and Engineering, University of Wisconsin - Madison # Analytical Sciences Division in the Department of Chemistry University of Wisconsin - Madison

5 GAMMA ATTENUATION TESTING *# PERFORMED WITH COBALT 60 TLD S FOR MEASUREMENT ANSI/HPS N13.11 WITH ACRYLIC PHANTOM *The University of Wisconsin Radiation Calibration Laboratory (UWRCL) # AAPM and A2LA accredited

6 Fraction ATTENUATION CO Transmission fraction of Co-60 gamma rays through ClearView R² = Transmitted fraction from experiment Curve Fit Thickness (cm) Thickness(in) Attenuation of CO % % 1 37% % % % Attenuation of CVRS

7 Steam Generator at Alvin W. Vogtle Nuclear Plant DEVELOPED APPLICATIONS Tubesheet region ~5-7 R/hr

8 PUBLICATION - OPERATIONAL RADIATION SAFETY

9 GAMMA ATTENUATION CS 131 Material and Thickness Elements Dose Rate on Contact* (mr/hr) Dose Rate at 1 cm (mr/hr) None 7 seeds/7 spacers Too high (>200) Too high (>200) None 1 seed Too high (>200) Too high (>200) 1.5 SS 1 seed SS 7 seeds/7 spacers /16 ClearView 7 seeds/7 spacers /32 ClearView 7 seeds/7 spacers /8 ClearView 7 seeds/7 spacers Thickness Dose Reduction 1/16 >99 % 3/32 >99 % 1/8 >99 % Protection against Low Dose Brachytherapy Isotopes such as Cs 131, I 125, Pd 103, etc. *Testing at Global Medical Innovation Center Georgia Institute of Technology

10 ATTENUATION SUMMARY Isotope Gamma Energy Thickness ClearView Dose Reduction Thickness Lead (Pb) (inches) (inches) I 131 * MeV % 0.12 HVL = 0.6 I 131 * MeV % 0.24 I 131 * MeV % 0.32 I 131 * MeV % 0.43 F 18 # MeV % 0.13 HVL = 0.9 F 18 # MeV % 0.32 F 18 # MeV % 0.5 F 18 # MeV % 0.67 * Testing done at University of Wisconsin Hospital and Clinics Nuclear Medicine department # Testing done at University of Wisconsin Hospital and Clinics Nuclear Medicine department

11 ATTENUATION SUMMARY Isotope Gamma Energy Thickness ClearView Dose Reduction % (inches) Ir * 0.38 MeV HVL = 0.75 Ir * 0.38 MeV Ir * 0.38 MeV Ir * 0.38 MeV Ir * 0.38 MeV Ir * 0.38 MeV * Testing done at University of Wisconsin Hospital and Clinics Department of Human Oncology

12 ATTENUATION SUMMARY Isotope Gamma Energy Thickness Dose Reduction Pb Thickness (inches) (inches) * Cs MeV % 0.12 HVL = 1 * Cs MeV % 0.45 * Cs MeV % 0.68 * Cs MeV % 0.95 *# Co MeV % 0.17 HVL = 1.5 *# Co MeV % 0.71 *# Co MeV % 1 *# Co MeV 5 90% 1.77 *Testing done at University of Wisconsin s Radiation Calibration Laboratory (UWCRL), an Accredited Dosimetry Calibration Laboratory by American Association of Physicists in Medicine. UWRCL is accredited through the American Association for Laboratory Accreditation for meeting the performance criteria of the internationally accepted ISO/IEC # ANSI/HPS N13.11, 2009(R2015) Testing

13 ATTENUATION TESTING *Testing at Memorial Sloan Kettering Cancer Center Considerations- 1. The distance between source and shield, shield and detector play a very vital role in attenuation. 2. Too much distance leads to sky shine effects and scatter in readings. 3. The source and detector are placed right up against the shield surfaces.

14 ATTENUATION SUMMARY *Testing at Memorial Sloan Kettering Cancer Center ISOTOPE Energy % Attenuation % Attenuation % Attenuation % Attenuation % Attenuation (kev) I Ba Tc I F Cs Zr I Lu 177, Co 57

15 % ATTENUATION ATTENUATION SUMMARY Ba I Tc - 99 I F - 18 Cs Zr - 89 I '' 1.5'' 3.0'' 0.75'' 2.5'' ENERGY (KEV)

16 WEIGHT COMPARISON Parameter Rolling Shield ClearView Length Width Thickness* Weight 280 lbs 142 lbs LEAD * 70% Dose reduction for Co 60 DENSITY GM/CC HVL WITH BUILDUP HVL W/O BUILDUP 0.43 (WITH BUILDUP REDUCES 44% COBALT GAMMAS = 1.25 OF CLEARVIEW) CLEARVIEW DENSITY 2.3 GM/CC HVL 1.5 CLEARVIEW 35 % LIGHTER W/O BUILDUP IN LEAD >50% LIGHTER WITH BUILDUP IN LEAD

17 COMPARISON LOW RADIATION SHIELDS *Bakshi. J., Radiation Attenuation and Stability of ClearView Radiation Shielding, Operational Radiation Safety, Health Physics Society, March 2018 Conventional Transparent Shield (thickness, mm) Pb. equivalent, (mm) Thickness ClearView (mm) Pb. Equivalence ClearView (mm) Direct Scientific Lead Acrylic (8 mm) Direct Scientific Lead Acrylic (12 mm) Biodex Lead Glass (8 mm) Biodex Lead Glass (12 mm) Biodex Lead Glass (22 mm) Biodex Lead Glass (35 mm) Leaded Glass - Ray Bar (7.0 mm mm) Radiation Products Leaded Acrylic (8 mm) Radiation Products Leaded Acrylic (12 mm) Radiation Products Leaded Acrylic (22 mm) Radiation Products Leaded Acrylic (35 mm) Marshield LX -57 b (9 mm) Marshield LX -57 b (14 mm) Marshield LX -57 b (17 mm) Marshield Lead Free Glass (12 mm) CLEARVIEW IS OUTPERFROMS EXISITING TRANSPARENT SHIELDS BETTER PERFORMANCE higher attenuation per unit volume CLEARVIEW IS LEAD - FREE AND NON - TOXIC

18 APPLICATION : SMALL ANIMAL RADIOTHERAPY RESEARCH Isotope Dose 12 (mrem/hr) Fluorine Iodine Iodine Iodine Manganese Zirconium Copper Cobalt Beta Emitters P 32, Sr 90, SrY 90 etc.

19 APPLICATION : INPATIENT RADIOTHERAPY Shielding from I-131 in MIBG Therapy for Neuroblastoma treatment Existing Lead Shield 4 x 3 Weighs ~ 800 lbs. Limitations Heavy Not transparent Toxic material Excerpts from N.Y. Times article from 2012 Couldn t be held or hugged and spent recovery time alone in a lead-walled hospital room. The child s mother the child spent time by himself, he communicated using walkietalkies, but it wasn't the same as actually being at his side. "The general rule is really no touching, you can t even sit on his bed." This made the five days after the therapy very difficult. "I just want to be with him when he is going through a really tough treatment," the mother recalled. "I want to snuggle with him and comfort him and read with him. They couldn t spend more than a combined total of 40 minutes in the room each day. SOURCE- RADIOACTIVE-RECOVERING-CANCER-TREATMENT-ARTICLE The child had to be kept in a special room at the University of Chicago s Comer Children's Hospital after his treatment. (THE CHICAGO TRIBUNE)

20 APPLICATION : MIBG THERAPY Feedback : These transparent shields will be used after MIBG therapy and will protect, both patients, visitors and staff. We have plans to do more research and write a paper on the operational function of these MIBG shields Use for Lu 177 * Picture from Memorial Sloan Kettering Cancer Center

21 APPLICATION : VIEWING WINDOW IN SUITES Windows in walls, construction alternate Concrete Clear View RS Density HVL C0 60, in (mm) 2.28(60.5) 1.5 (38.1) MSKCC UW Madison Shielded office spaces

22 Arm Cut Outs Oncologists (Implants) APPLICATION : PEDIATRIC CRIB SHIELD Boston Children s / Harvard Cook Children s and MD Anderson

23 University of Michigan Mott Children s APPLICATION : SHIELDED WASTE CONTAINER Urine Bag Container The urine bag measures 30cm x 30cm. The tubing 1.0cm & 1.5 cm Dose rate 0.22 mr/h at 1.0 m/mci. Bag is emptied every 4 hrs, maximum activity 50 mci, making 11 mr/hr at 1.0 m

24 APPLICATION : GCMS SHIELDING Cardinal Health

25 IR, FLUOROSCOPY, CATH LAB

26 NUCLEAR MEDICINE SHIELDING WINDOWS CABINETS DISPOSAL CONTAINERS TRANSPORTING ACTIVATED MATERIAL TOOL STORAGE

27 NUCLEAR MEDICINE SHIELDS

28 CYCLOTRON OPERATION AND MAINTENANCE Portable Glovebox

29 Phone: (434) MEDICAL FEEDBACK Hospital RSO I appreciate the opportunities offered by a liquid solution, configurable therefore to suit a variety of difficult shielding geometries. Hospital Nurse I think that the shields would be helpful in minimizing patient anxiety when separated from their caregiver. It would also likely minimize parental exposure to radiation as they could more easily talk to their child from their chair when the child can actually see them. Clinical Expert in a Hospital I think the clear shield would certainly benefit the patients, families and staff by allowing more visibility. How can we save dose by adding lightweight transparent shielding to your work areas? How can we make working in radiation area comfortable? THANK YOU