Transcription of Radiation Physics Note / 放射線 ... - dent.niigata …
1 2018. 12. 25 1 ~ ~ (electromagnetic wave) electromagnetic Radiation (particles)
2 Corpuscular Radiation charged particles uncharged particles --- (ionizing Radiation ) directly ionizing Radiation indirectly ionizing Radiation (non-ionizing Radiation ) ( ) ( ) ( 2 2018.)
3 12. 25 3 2018. 12. 25 c 1 108m 107m 108 107 /s Hz E h h c/ 10-25[J m]/ [eV m]/ [keV ]/ Duane-Hunt eV V 10-19[C] [V] 10-19[J] 4 30 km c 1 1 1 1 m LED ~ 2018. 12. 25 X Wilhelm Conrad R ntgen 1895 11 8 Crookes X 10-8 10-14m 108m/sec = (m) (sec-1) ( 108m /sec) = (J) ( 10-34J sec)
4 5 2018.
5 12. 25 6 2018. 12. 25 CT E=kZIV2t k (= 10-9) I 1% 99% 19 (74W) CBCT CT 1mmAl 70kV (15cm ) 7 2018.
6 12. 25 8 2018. 12. 25 ][ ][ ][ ]/[ ][ min Duane-Hunt min Vmax= min Vmax kV KLILIILIII1 3p M 3s M [keV]9 (1991/3 2018. 12. 25 Kramers 1959 K 60kV K K 70kV K K 15 30keV 511keV 2)
7 ======================================== ================= IP 10 2018. 12. 25 I0 I I=I0e- d kZ3 3 --- Z / ex. 11 (1991/3 (2007/2) X 2018.)
8 12. 25 Zeff Zeff Evans, 1955 (Attix, and Roesch, , eds.: Radiation Dosimetry. Vol. I : Fundamentals. Academic Press Inc., New York, 1968.) c= : Z=125*E3/2-3 c= : Z=1900/( +6)+2 12 2018. 12. 25 = = 3~4 = = 3~4 14 7=143~473~4=23~4=8~16 D1 D1 D2 1/4 D1 Hc=D1/D2 Hc<1 D2/D1 I=I0e- d cf.
9 IP 13 2018. 12. 25 exposure, X [C/kg] X=dQ/dm dQ dm Kerma, K Gy [J/kg] K=dE/dm dm absorbed dose, D Gy [J/kg] D=de/dm de dm equivalent dose, HT Sv [J/kg] HT= wR DT,R DT,R T R wR HT R wR DT,R Effective Dose, E Sv [J/kg]
10 E= wT HT wT X [C/kg]X, exposure R 1R= D Gy[J/kg] absorbed dose rad HT Sv[J/kg] equivalent dose rem HT= wR DT RwR : E Sv[J/kg] effective dose rem E= wT HTwT : A Bq[ / ] activity Ci1Sv=100rem 1Gy=100rad WR=1 14 D=HT 2018. 12. 25 (dt) (dN) -dN/dt Bq [1/sec] (RI) --- --- --- EC: Electron Capture --- (IT: Isomeric Transition) N=N0e- t N:t N0 t=0 T.
