5   External Radiation Protection

5 External Radiation Protection PowerPoint PPT Presentation


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a???. ???: 210Po?238Pu?239Pu?241Am?237Np?235U? 238U???: ???:??????????????,????????????:a??????????????. ???. ???: 3H?14C?22Na?45Ca?55Fe?58Co?63Ni?137Cs?85Kr?90Sr-90Y???(???????): ??????????:???????????,???????? Sr?Cs???????? H?C???????????:????????. ?

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5 External Radiation Protection

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1. ?5? ????? (External Radiation Protection) ???: ?????????????????? ????????????????????

2. a??? ???: 210Po?238Pu?239Pu?241Am?237Np?235U? 238U? ??: ???:??????????????,?????????? ??:a??????????????

3. ??? ???: 3H?14C?22Na?45Ca?55Fe?58Co?63Ni?137Cs?85Kr?90Sr-90Y? ??(???????): ??????????:???????????,???????? Sr?Cs???????? H?C????????? ??:????????

4. ???? ???:60Co?137Cs?192Ir? ??:??????????? ??:????????????????????

5. ??? ??: ??????????????????? ????????????????? ??:???????

6. ?????????

7. ????????? (1)????(Time) ???????????? ??:????,??????

8. ?????????: (3)????(Shielding) ????? ??????????: ???????????????

9. ???????????

10. ???? ???:???(??)???????? ???:???????????? ??????????

11. ?????????????? ?????(narrow beam): ???????????

12. ??????? ?????: ???????????,?????????????????????

13. ??(broad beam) ?????

14. ???????????? ????K : ?????????????????????H(0),??????d???????????H(d)???? K = H(0)/H(d) = ed/B(E?,d) ??????????????? ????

15. ???????????? ??????1/2:half value thickness ??????????????????

16. ???????1/2, ?1/10 (cm)

17. ??????? ???????

18. ??1 ?Co-60????????2000?,???????????? ?:??K=2103, ???Co-60??1/2 =1.2cm ?:n=(log 2103)/log2=11 R=n?1/2 =11 1.2=13.2cm

19. ??2 ?????Co-60???,????3754??,????????0.25mR/h,???????,???????????? ?:A=3754Ci, G=1.32 Rm2/hCi R=3m, X=0.25mR/h ????,????????

20. ??3 ????????3.71014Bq?60Co???????????,??????????????210-3Svh-1,????1m??????????10-4Svh-1????????????25cm,??????????? (???G(60Co)=2.503 10-18Ckg-1m2Bq-1 s-1)

21. ??????-???????? ??: ????????????? ????: ????(????????) ????(???????) ????:??????? ?????-?????-????? ????????

22. ?????????????

23. ????? ???????>70keV,???????,?????????? ??(Range;R): ????????????????????????? ??????????????????????,????????? ?????????: ??Bq?:??????,??????? ???:??????,>R??????

24. ????

25. ???? (2)???? ????????????????? ?????????n???????? ???????1/2n?

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