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身在輻中要知輻
二林高中 IYC 2011系列活動
二林高中圖書館 主辦
高中部化學科 協辦 林克修 主講
輻射
Radiation
Radium
1903年物理獎
1911年化學獎
談輻色變
看不到
摸不到
聞不到
沒有感覺
輻射外漏?
輻射是一種能量
輻射物質外漏,會造成人體健康的危害
輻射的種類
游離輻射:
電磁輻射:加馬(γ)射線、X射線
粒子輻射:阿伐(α)粒子、貝他(β)粒子、 中子(n)、
質子(P)
非游離輻射:
電磁波譜
非游離輻射
游離輻射
游離輻射的來源
天然輻射:
宇宙射線、地表輻射、氡、人體輻
射、食物
人造輻射:
醫療暴露、農工應用、生活消費品、
其他(核爆落塵……等等)
241Am(鋂)
輻射的活度單位
活度單位:描述放射性核種的衰變次數。
貝克(Bq) 與 居里(Ci)
福島第1核電廠2號機取水口附近往大海流出的輻射量
為總流出量估計520噸,輻射量約4700兆貝克,相當
於平時1年間流出限量的2萬倍
輻射的劑量單位
劑量單位:描述輻射對人體的影響程度。
實例:西弗(Sv) 與 侖目(rem)
西弗:人體每公斤接受⼀一焦耳加馬 (γ) 射線的能量
1 Sv = 1 J / Kg = 103 mSv = 106 μSv
實例說明
每天看電視1小時,一年約吸收0.02毫西弗
小於0.01 毫西弗/年,則可視為忽略
胎兒受孕至出生,不得超過5.00毫西弗
距離核電廠21公里處,測得330微西弗/小時
原能會草案:2μSv/hr則停課;20μSv/hr則停班
輻射強度
與輻射源距離平方成反比
暴露時間愈長,愈危險
安全標準
年有效等效劑量不超過五毫西弗。
個別器官或組織之年等效劑量不超過
五十毫西弗。
場所主管應確保其輻射作業,對⼀一般人
造成之年有效等效劑量,不超過⼀一毫西
弗。
案例說明A
某位患者在今年內進行的醫療檢查:
為了植牙,已做了10次的全口X光攝
影;檢查肺炎,做了4次胸部X光攝影。
10 x 0.01 + 4 x 0.02 + 1.60 = 1.78 (mSv)
1.78 mSv < 5.00 mSv
案例說明B
某位貴婦在今年進行的檢查:
腰脊X光攝影1次;頭部電腦斷層掃瞄
2次。
1 x 1.50 + 2 x 2.00 + 1.60 = 7.10 (mSv)
7.10 mSv > 5.00 mSv
人造輻射的成長
天然
50%
人造
50%
2006年
天然
86%
人造
14%
1987年
E = MC2
福島核災變
複合式災變、備用電力系統癱瘓
3/15 3號機附近,一度測出40萬微西弗/小時
微量Pu外洩
半衰期(Half Life)
放射性物質的半衰期
131
I超標;半衰期8天
137
Cs超標;半衰期30年
14
C 半衰期5730年
238
U 半衰期45億年
自我防護
TSD法則:Time、Shield、Distance
避免讓放射性物質核種進入身體
外部防護:口罩、沖洗
內部防護:碘片,即KI。
IYC 2011
Chemistry--- Our Life, Our Future......
http://kahshiou.blogspot.com
謝謝您的聆聽
ありがと
Thank U
Merci Beaucoup

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Radiation 2011