but we have nevertheless been polluting it for years.
The atmosphere can be divided vertically into four major layers : troposphere, stratosphere, mesosphere, and thermosphere.
Figure 2.1 The earth’s atmosphere is subdivided vertically into four major regions based on the air-temperature profile. The ozone layer that protects us from the sun’s UV radiation is in the stratosphere.
2) 일라이트의 특성
-물속의 부유물질을 흡착하고, 음이온을 띠기 때문에 양이온의 부유 미립자와 전기적인 중화로 응집 침전을 유발하여 물을 깨끗하게 한다.
-특정 방사성 물질에 대한 흡착/분해 능력이 뛰어나다.
-물/토양/대기 중에서 각종 중금속 및 유독가스를 흡착, 탈취, 분해한다
-세포
1. What is Ionizing Radiation?
Ionizing Radiation
: has sufficient energy to remove an electron from an atom
Ex. α-particle, β-particle,
X-ray, γ-ray
Free Radical :
molecule containing unpaired electrons
2. Effects of Ionizing Radiation
Radiation causes ionization of atoms which are forming cells.
→ Tissues
→ Organs
→ The whole body
Cellular Damag
(1) no effective treatment
(2) lung transplantation
(3) smoking cessation
7) 예후
Factors influencing progression
① cumulative exposure to asbestos
② duration of exposure
③ type of asbestos exposure
3. 탄광부 진폐증 (Coal Worker's Pneumoconiosis)
1) 석탄분진을 흡입하여 발생
2) simple : opacity < 1 cm
radiate food have been influenced by the adoption, in 1983, of a worldwide standard covering irradiated foods. The standard was adopted by the Codex Alimentarius Commission, a joint body of the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO), responsible for issuing food standards to protect consumer health and facilitate fair practice in food