《放射治疗剂量学》课程教学资源（PPT专题讲稿）Radiation Protection Refresher Course New Concepts in Radiation Shielding for Radiotherapy Facilities

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting Radiation Protection Refresher Course New Concepts in Radiation Shielding for Radiotherapy Facilities IAEA Report 47 Raymond K.Wu,PhD OhioHealth Hospitals Columbus,OH

Radiation Protection Refresher Course New Concepts in Radiation Shielding for Radiotherapy Facilities IAEA Report 47 Raymond K. Wu, PhD OhioHealth Hospitals Columbus, OH 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting IAEA Report 47 Radiation Protection in the Design of Radiotherapy Facilities

IAEA Report 47 Radiation Protection in the Design of Radiotherapy Facilities 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting Safety Reports Series N0.47 ©IAEA.2006 Printed by the IAEA in Austria September 2006 STI/PUB/1223 Radiation Protection in the Design of http://www- Radiotherapy Facilities pub.iaea.org/MTCD/publications/ PDF/Pub1223 web.pdf (AEA

http://www￾pub.iaea.org/MTCD/publications/ PDF/Pub1223_web.pdf 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting NCRP REPORT No.151 STRUCTURAL SHIELDING DESIGN AND EVALUATION FOR MEGAVOLTAGE X-AND GAMMA-RAY RADIOTHERAPY FACILITIES 人0a NCRP 08.16.2007

7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting Learn ·Calculation methods W,U,T,IDR,TADR,Rw,Rn, ·Dose at maze door Neutron,capture gamma at door Public dose limit in-any-hour

Learn • Calculation methods • W, U, T, IDR, TADR, RW, Rh, • Dose at maze door • Neutron, capture gamma at door • Public dose limit in-any-hour 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting NCRP REPORT No.49 STRUCTURAL SHIELDING National Council on DESIGN AND Radiation Protection EVALUATION FOR and Measurements MEDICAL USE OF X RAYS AND GAMMA RAYS OF ENERGIES UP TO 10 Mev www.NCRPonline.org www.ncrp.com NCRP National Council on Radiation Protection and Measurements

7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting National Council on Radiation Protection and Measurements www.NCRPonline.org www.ncrp.com

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting New Issues since NCRP 49 New types of equipment, Some with energies above 10 MV, Many new uses for radiotherapy equipment, Dual energy machines, Room designs without mazes, Varied shielding materials including composites, More published data on empirical methods. Instantaneous Dose Rate interpretation problems

New Issues since NCRP # 49 – New types of equipment, – Some with energies above 10 MV, – Many new uses for radiotherapy equipment, – Dual energy machines, – Room designs without mazes, – Varied shielding materials including composites, – More published data on empirical methods. – Instantaneous Dose Rate interpretation problems 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting Increased data for: ·neutron production ·capture gamma rays scatter fractions 。scatter albedo 。activation ·laminated barriers ·IMRT factors

Increased data for: • neutron production • capture gamma rays • scatter fractions • scatter albedo • activation • laminated barriers • IMRT factors 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting Public Dose Limits for continuous exposure Annual limit of 1 mSv ED for man-made sources excluding background and exposures from personal medical care Unless can be documented otherwise, per site limit is 0.25 mSv NCRP116(1993)

Public Dose Limits for continuous exposure NCRP 116 (1993) • Annual limit of 1 mSv ED for man-made sources excluding background and exposures from personal medical care • Unless can be documented otherwise, per site limit is 0.25 mSv 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting

7th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting Public Dose Limits 0.25 mSv /yr per site Medical Other (0.53 mSv) sources 15% Annual 1% background Consumer products radiation doses in (0.005- 0.13mS) USA 2% Cosmic, Radon terrestrial, (2.0ms) 3.6 mSv yr intemal 55% (1.0msv) 27%

Public Dose Limits 0.25 mSv / yr per site Annual background radiation doses in USA 3.6 mSv / yr 7 th Asia-Oceania Congress of Medical Physics and 13th CSMP Annual Meeting