b Thomas Jefferson University Hospital Jeferson Health System RECEIVED Office of Radiation Safety R&C.\O?! 1

November 10,2006

Mr. Dennis Lawyer 6 U.S. Nuclear Regulatory Commission 3- Region 1 h S-lcc 475 Allendale Road Members 37*07q33-15 Albert Einstein King of Prussia, PA 19406 Healthcare Network 030 I Albert Einstein aW6 Medical Center Belmont Behavioral Re: Use of Long-Lived Radioisotopes at Delaware Valley College Health Prior to July 31,2004 Germantown Hospita and Community Health Services Dear Mr. Lawyer: MossRehab Willowcrest This is in response to your telephone inquiry regarding long-lived radioisotope Frankford Health Care System use in laboratory locations at the Delaware Valley College campus location, Frankford Campus previously licensed under our License No. 37-00148-06 prior to transfer to Torresdale Campus Drexel University School of Medicine. Main Line Health Bryn Mawr Hospital During the period July 1, 1998 to July 31, 2004, the following activities of Bryn Mawr Rehab Lankenau Hospital hydrogen-3 were received for use by authorized user (a.k.a. “licensee”) Dr. Paoli Memorial Timothy Block. Hospital Magee Rehabilitation First Half 1999 1.O millicurie Thomas Jefferson Second Half 1999 0.75 millicurie University Hospital Methodist Hosoital First Half 2000 6.0 millicurie Second Half 2001 1.25 millicurie Jefferson HealthCARE physicians Dr. Block was authorized for radioactive materials work during that time in the following rooms: Jefferson HomeCARE 118 DVC (Mandell Science Bldg.) Jefferson SeniorCARE 125 DVC (Mandell Science Bldg.) Methodist Hospital 127 DVC (Mandell Science Bidy.) Nursing Center 128 DVC (Mandell Science Bldg.) Mid County Senior Services The Wayne Center Sewer disposal of H-3 within Dr. Block’s laboratories took place in the sink drain within Room 127 (location identified as ‘IF-6” on enclosed sketch.

Alliance Partners Disposals by quantity and date are shown below (information from inventory record data for Dr. Block), Pottstown Memorial Medical Center Riddle Memorial Date Amount Drain Disposed Hospital Underwood-Memorial 12/08/99 25 micorcurie HosDital 12/22/99 25 microcurie @5/10/00 15 microcurie 0511 6/00 34 microcurie 11 /O5/01 48.5 microcurie

919 Walnut Street STE 820 Philadelphia, PA 19107-5233 215-955-7813 Fax: 215-923-9039 www.jeffersonheakh.org No other radioisotopes with half-lives greater than 120 days were utilized at these locations prior to July 31, 2004.

We would like to note that under our program, radioisotope users are required to maintain a drain disposal log kept "at the sink", to track disposals via individual drains. These logs remained in situ within the DVC locations at the time that these laboratories were transferred to Drexel University School of Medicine, as the labs remained as active radioisotope locations at that time.

I hope that this information will be useful to you. Please contact me or my staff if you require any additional information or clarification.

John C. Keklak 4. Radiation Safety Officer Thomas Jefferson University Hospital, Inc.

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