Presentation is loading. Please wait.

Presentation is loading. Please wait.

輻射防護新趨勢研討會 Introduction to Draft 2005 Recommendations from ICRP Ching-Pang Lu Kuosheng Nuclear Power Plant, Taiwan Power Company 18/10/2004

Similar presentations


Presentation on theme: "輻射防護新趨勢研討會 Introduction to Draft 2005 Recommendations from ICRP Ching-Pang Lu Kuosheng Nuclear Power Plant, Taiwan Power Company 18/10/2004"— Presentation transcript:

1 輻射防護新趨勢研討會 Introduction to Draft 2005 Recommendations from ICRP Ching-Pang Lu Kuosheng Nuclear Power Plant, Taiwan Power Company 18/10/2004 email: u807711@taipower.com.tw

2 輻射防護新趨勢研討會 1 ‧ Recommendations of ICXRP(1928 - 1950) ‧ ICRP-1 ( 1959 ) ‧ ICRP-6 ( 1964 ) ‧ ICRP-9 ( 1966 ) ‧ ICRP-26 ( 1977 ) ‧ ICRP-60 ( 1991 ) ‧ ICRP- ??( 2005 ) History of the ICRP ecommendations

3 輻射防護新趨勢研討會 2 The 1990 system of protection, set out in Publication 60 (ICRP 1991), was developed over some 30 y. During this period, the system became increasingly complex as the Commission sought to reflect the many situations to which the system applied. - Roger H. Clarke (Health Phys. 87(3):306 –311; 2004 ) ICRP-60 回顧( A review of ICRP-60 )

4 輻射防護新趨勢研討會 3 Major reasons for the change of the recommendations addressed by ICRP The complexity of ICRP-60 is logical but not easy to explain the variations between different applications. Confusion between dose limits and action levels. The concept of “constraint” has not been clearly explained. The cost-benefit analysis procedures for ALARA and optimization (ICRP-37 & 55) have been never adopted. The misuse of collective dose - widely used over world population and all time. LNT controversy and confusion. The new biological data.

5 輻射防護新趨勢研討會 4 Development of the new ICRP recommendations - essential milestones 1998 1999 2000 2001 2002 2003 2004 2005 Critical review on current system by Clarke ( HPS ) Initial proposal promulgated through IRPA and JRP for discussion. Comments from IRPA-10 /Began to develop the new recommendations. Continual debates with iteration of ideas at the international forums or workshops held by OECD/NEA, etc. Presentation at IRPA-11/Draft text of the 2005 ICRP recommendations for consultation. The new recommendations will be issued.

6 輻射防護新趨勢研討會 5 Main features of the new recommendations Complementing the constraints and limits with the requirements for the optimization of protection from a source. The need for stability in international and national regulations has been taken into account. Reflecting both the scientific understanding of the biological effects and the social and ethical standards. Simpler approach based on “individual oriented” philosophy rather than current “society oriented” criteria. Emphasizing that procedure of diagnostic or therapeutic should be justified with clinical benefit for the patient dose. Incorporating a policy for radiological protection for non-human species in the new system. Quantifying the most basic level of protection from single source in all situations - Maximum dose constraints.

7 輻射防護新趨勢研討會 6 Essential changes in the new recommendations ( Summarized by Roger H. Clarke, 2004 ) Linearity Current Clarify concept and applicable range, i.e., above a few mSv /y New Linear non-threshold, i.e., proportionality The LNT controversy: Academically interesting but practically meaningless!! Abel J. González

8 輻射防護新趨勢研討會 7 低劑量下的劑量回應關係( The dose-response relationship at low-doses ) 資料來源; Abel J. González, Radiation safety and their application: International policies and current issues, Health Physics: Volume 87(3) September 2004 p262. △ D = △ D △ D 1 = △ D 2 △ p = △ p △ p 1 = △ p 2

9 輻射防護新趨勢研討會 8 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Radiation weighting factor New ICRP-60 Revised values for protons and neutrons(ICRP-92) Current

10 輻射防護新趨勢研討會 9

11 10 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Tissue weighting factor New ICRP-60 New values based on revised risk factors and a simplified basis/individual organs changed Current

12 輻射防護新趨勢研討會 11

13 輻射防護新趨勢研討會 12 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Nominal risk coefficient Current ICRP-60 Risk coefficients for Total cancer fatality slightly modified /Hereditary use UNSCEAR (2001) New

14 輻射防護新趨勢研討會 13 May be typing error

15 輻射防護新趨勢研討會 14 Don’t use Nominal risk coefficient or effective dose for: - Estimating risks retrospectively for individuals. - Epidemiological purposes with populations. Caveat on effective dose and nominal risk coefficients

16 輻射防護新趨勢研討會 15 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Dose limits Current Worker and public in ICRP-60 Incorporated into revised constraints /only applied to all sources in normal situation. New

17 輻射防護新趨勢研討會 16 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Constraints Current 30 numerical values for constraint in the 10 ICRP reports, level of concern Effective dose Number and complexity to be reduced New

18 輻射防護新趨勢研討會 17 ‧ Factor influencing the choice of individual dose constraints Major Concepts of the new ICRP recommendations Annual effective dose from natural radiation sources 1msv/a to which rounded from 1.2msv with a range 0.8 to 2.4msv quoted in UNSCEAR 2000 by ICRP Excluding radon The need for action vs. individual effective dose

19 輻射防護新趨勢研討會 18 Recommended maximum values for dose constraints on single sources 100 Emergencies, evacuations, no justification above 20 Some benefits to exposed individuals 1 Societal rather than individual benefit 0.01 Minimum value Incremental dose mSv in a year Natural background~ (1 mSv/a) from : Richard V. Osborne, 2004

20 輻射防護新趨勢研討會 19 INDIVIDUAL- AND SOURCE-RELATED CONCEPTS 資料來源: Ches Mason, INDIVIDUAL- AND SOURCE-RELATED CONCEPTS 資料來源: Ches Mason, International Conference on National Infrastructures for Radiation Safety Rabat, Morocco 1-5 September 2003 INDIVIDUALS ARE PROTECTED FROM ALL REGULATED SOURCES BY THE DOSE LIMITS INDIVIDUALS ARE PROTECTED FROM A SINGLE SOURCE BY THE DOSE CONSTRAINT

21 輻射防護新趨勢研討會 20 Dose Limit from : Richard V. Osborne, 2004

22 輻射防護新趨勢研討會 21 Dose Constraint from : Richard V. Osborne, 2004

23 輻射防護新趨勢研討會 22 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Collective dose Current ICRP-60 Disaggregated and replaced by weighted dose matrix New

24 輻射防護新趨勢研討會 23 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Justification Current Retained, extended for patient exposure New ICRP-60

25 輻射防護新趨勢研討會 24 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Optimization Current Stakeholder involvement New Cost-benefit analysis

26 輻射防護新趨勢研討會 25 ‧ Stakeholder involvement Major Concepts of the new ICRP recommendations One of the major achievements of ICRP for developing the new recommendations is the role that is now recognized to “stakeholder involvement” in the optimization process as a mean to improve the quality of the decision aiding process for identifying and selecting protection actions considered as being accepted by all those involved.

27 輻射防護新趨勢研討會 26 Roger Clarke noted that cultural differences make it difficult for stakeholders from different parts of the world to participate equally in developing international regulatory guidance such as that offered by ICRP.

28 輻射防護新趨勢研討會 27 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Exemption Current ICRP-60 New Replaced by exclusion

29 輻射防護新趨勢研討會 28 Exclusion

30 輻射防護新趨勢研討會 29 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Definition of ‘individual’ CurrentNew ICRP-29 New consideration age-weighted approach Characterising the individual Time frames and spatial distributionsUncertainty

31 輻射防護新趨勢研討會 30 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Practice CurrentNew ICRP-60Retained

32 輻射防護新趨勢研討會 31 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Intervention CurrentNew ICRP-60Incorporated into constraints

33 輻射防護新趨勢研討會 32 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Natural radiation sources CurrentNew Radon-222 only Comprehensive treatment

34 輻射防護新趨勢研討會 33 Essential changes in the new recommendations ( summarized by Roger H. Clarke, 2004 ) Environment (nonhuman) Current Assumed protected in ICRP-60 New Explicitly addressed

35 輻射防護新趨勢研討會 34 人類與其他物種輻射防護系統共同架構示意圖( Developing a common approach for the radiological protection of humans and non-human organisms )資料來源: Annals of ICRP Volume 33, issue 3, A framework for assessing the impact of ionising radiation on non-human species, ICRP Publication 91, September 2003, p.254.

36 輻射防護新趨勢研討會 35 References 1.ICRP, 1990 Recommendations of the International Commission on Radiological Protection. ICRP Publication 60. Annals of the ICRP 21 (1-3), Pergamon Press, 1991. 2.Summary excerpted from the draft ICRP Recommendations that will be subjected to public consultation from June 2004. 3.IRPA 11Daily Newsletter 25th of May 2004. 4.The Future Policy for the Radiological Protection Workshop Proceedings, OECD/NEA, Lanzarote, Spain, 2-4 April, 2003. 5.ICRP Publication 91, A framework for assessing the impact of ionising radiation on non-human species, Annals of the ICRP Volume 33, Issue 3, Pergamon Press, 2003.

37 輻射防護新趨勢研討會 36 References 6.ICRP Publication 92, Relative biological effectiveness (RBE), quality factor (Q), and radiation weighting factor ( w R ), Annals of the ICRP Volume 33, Issue 4, Pergamon Press, Oxford, UK, 2003 7.2005 Recommendations of the International Commission on Radiological Protection (Draft for Consultation), 21 June 2004. 8.Abel J. González, Radiation safety and their application: International policies and current issues, Health Physics: Volume 87(3) September 2004. 9.Ches Mason, International Conference on National Infrastructures for Radiation Safety Rabat, Morocco 1-5 September 2003, IAEA.

38 輻射防護新趨勢研討會 37 References, 10.Roger H. Clarke, Draft recommendations from ICRP at the start of the 21ST century, Health Physics: Volume 87(3) September 2004. 11.Richard V. Osborne, Are the Proposed Recommendations of the International Commission on Radiological Protection Taking Us in the Right Direction? Robert S. Landauer, Sr. Lecture, 49th Annual Meeting of the Health Physics Society, Washington, DC, 2004 July 11-15. 12.Stakeholder Participation in Radiological Decision Making- Processes and Implications-Third Villigen Workshop, OECD/NEA, Villigen, Switzerland - 21-23 October 2003.


Download ppt "輻射防護新趨勢研討會 Introduction to Draft 2005 Recommendations from ICRP Ching-Pang Lu Kuosheng Nuclear Power Plant, Taiwan Power Company 18/10/2004"

Similar presentations


Ads by Google