Series Lecture "Concept of Dosimetric Quantities Used in Radiation Protection" Second Lecture "Evolution of Quality Factor Q(L) and Radiation Weighting Factor wR"

Abstract

In the field of radiation protection, quality factor Q(L) and radiation weighting factor wR are important coefficients for estimating both radiation protection and operational quantities to the mixed types of radiation exposure. However, some inconsistencies might be found between Q(L) and wR for estimating effective dose, for example. Some inconsistencies are attributed to incomplete definition of terms Q(L) and wR. This report presents the root and evolution of quality factor Q(L) and radiation weighting factor wR for the years 1931-2007, to clarify the current issues of inconsistencies to be solved. KEY WORDS: quality factor, radiation weighting factor, RBE, LET, ICRP, ICRU, dosimetric bilocality, dosimetric inconsistency. I ‚Í ‚ ¶ ‚ß ‚É •úŽË •ü ‚Ì "í ‚Î ‚-Ê ‚ðŽ¦ ‚· •ü-Ê ‚AE ‚¢ ‚¤ŠT"O‚Í, •ú ŽË •üŽ¡-Ã, Ž-OEÌ, •úŽË •ü-hOEì‚È‚ÇŽg-p ‚Ì-Ú "I ‚Å‚» ‚ê ‚¼‚êˆÙ‚Ȃ邼‚êˆÙ‚È‚é•B •ú ŽË •ü-hOEì‚Ì-Ú "I ‚ÅŽg-p ‚³ ‚ê ‚é •ü-Ê ŠT"O‚Å‚ ‚é-hOEì-Ê, ŽÀ-p-Ê ‚ł͈قȂÁ‚½Ží‚ł͈قȂÁ‚½Ží-Þ ‚Ì •ú ŽË •ü ‚É‚ae‚é •l 'Ì ‰e ‹¿ ‚ð‰Á ŽZ ‚µ‚Ä•] ‰¿ ‚· ‚é •K-v ‚ª ‚ ‚é ‚½‚ß, ‚»‚ê ‚¼‚ê ‚É'Î ‚µ‚Ä•ú ŽË •ü ‰× •dOEW •" ‚â •üŽ¿OEW •" ‚ª-p ‚¢ ‚ç‚ê ‚é0‚µ ‚©‚µ, ‚±‚ê ‚ç‚Ì OEW •" ‚Í •K‚¸‚µ‚àK‚¸‚µ‚à-¾ Šm ‚ÉŠÖ˜A‚ÉŠÖ˜A•t ‚¯ ‚ç ‚ê ‚Ä‚¢ ‚é ‚í ‚¯ ‚Å‚Í ‚È‚¢ ‚½ ‚ß, •úŽË •ü-hOEì 'Ì OEn ‚É•s •®• ‡ ‚Ì-â'è "_‚ª • ¶ ‚ ¶‚Ä‚¢‚é ‚¨‚»‚¨‚» ‚ê ‚ª ‚ ‚é•B-{•e ‚Å‚Í ‚±‚ê ‚ç‚Ì OEW •" ‚ɂ‚¢ ‚ÄŠT"O‚Ì •¬-§ ‚© ‚çICRP•VŠ© ••(ICRP Publ. 103)‚É ‚¨‚¯‚¨‚¯ ‚éˆÊ'u•t ‚¯ ‚Ü‚Å ‚Ì-ñ75"N ŠÔ ‚Ì-ð Žj"I •Ï 'J ‚ɂ‚¢‚Ä, ‰Â "\ ‚ÈOEÀ ‚蕪 ‹' ‚AE ‚È‚éˆø-p • ¶OE£ ‚ð-¾ Ž¦ ‚µ‚Ä‹L•q ‚µ, OE» •ó ‚Ì ‰Û 'è ‚É‚Â‚¢ ‚Ä•®-•‚µ‚½•B II RBE‚AE•ü Ž¿OEW •" •üŽ¿OEW •"Q(L)‚¨‚ae‚Ñ‚¨‚ae‚Ñ•úŽË •ü‰× •dOEW •"WR‚Ì 'l ‚Ì 'I 'ð ‚É ŠÖ‚µ‚Ä, Šm-¦ "I ‰e ‹¿ ‚ÉŠÖ ‚· ‚éRBE(relative biological effectiveness: • ¶•¨ Šw"I OEø ‰Ê "ä ‚Ü‚½‚Í • ¶ •¨ OEø ‰Ê "ä), ‚AE‚-‚ÉŠm-¦ "I ‰e ‹¿ ‚ÉŠÖ ‚· ‚é'á •ü-Ê ‚É‚¨‚¯‚É‚¨‚¯ ‚éRBE‚Ì •Å'å 'l ‚Å ‚ ‚éRBEM‚Í •d-v ‚ȈÓ-¡ ‚ðŽ•‚Â•B•ü Ž¿OEW •"Q(L)‚¨‚ae‚Ñ‚¨‚ae‚Ñ •ú ŽË •ü‰× •dOEW •"WR‚Ì 'l ‚Í ƒqƒg‚Ì "Ó"-•«Šm-¦ "I ‰e ‹¿, "Á ‚É‚ª ‚ñ ‚ÌRBEM‚Ì 'å ‚«‚³ ‚ð•\ ‚· ƒpƒ‰ ƒ••[ ƒ^‚Å‚ ‚é ‚AE •l ‚¦ ‚ç‚ê ‚é •B‚±‚Ì •Í ‚Å‚ÍRBE‚¨‚ae‚Ñ‚Å‚ÍRBE‚¨‚ae‚Ñ, •ü Ž¿OEW •" ‚Ì ŠT"O‚Ì •¬-§ ‚AE 'l ‚Ì •Ï 'J ‚AE ‚» ‚Ì •ª ‹' ‚ɂ‚¢‚Ä•q‚× ‚é •B RBE‚Ì ŠT"O‚Ì •¬-§ ‚ÍICRP Publ. 921)‚É•q ‚× ‚ç‚ê ‚Ä‚¢ ‚é •B'RBE'‚AE‚¢ ‚¤-p OEê ‚Ì •Å•‰ ‚Ì Žg-p ‚Í, 1931"N ‚ÉFAILLA ‚AEHENSHAW2)‚ªX•ü ‚¨‚ae‚уÁ‚¨‚ae‚уÁ •ü ‚ɂ‚¢‚Ä‚Ì • ¶ •¨ Šw"IOEø ‰Ê •-1(Š")ŽO •H'• • ‡OE¤ ‹ †•Š; "OE ‹ž "s•ç 'ã "c‹ae'å Žè'¬2-3-6 (T100-8141)