Radioactive radiation is a penetrating particle beam emitted from the nucleus when unstable elements decay, which is divided into three types: A-ray, B-ray and C-ray, among which C-ray has the strongest penetrating power. In addition, radiation is harmful to the environment and human body.
Ionizing radiation types include alpha radiation, beta radiation and gamma radiation. X-ray radiation belongs to gamma radiation, which can spread in the air for a long distance and has strong penetrating power, but its penetrating power is weakened in some substances with higher atomic numbers.
Therefore, lead plates and concrete brick walls are often used as materials for shielding X-ray radiation. The design of walls, doors and windows in the equipment room of hospital imaging department should meet the requirements of radiation protection laws and regulations, and can only be used after being tested by qualified institutions.
Extended data:
Harm of radiation to human health;
Effects on cardiovascular system: tachycardia, bradycardia, arrhythmia, palpitation, decreased blood pressure, headache, menstrual disorder in some women, bradycardia, irregular sinus heart rate, leukopenia and thrombocytopenia, fatigue, decreased immune function, etc. The main manifestations of subjective feelings can be palpitations and chest tightness.
2. Influence on nervous system: Electromagnetic waves can interfere with the bioelectric activity of brain cells. Mainly manifested as dizziness, fatigue, sleep disorders, memory loss and so on.
3. Influence on the visual system: The eyeball lens has poor heat dissipation performance and is sensitive to electromagnetic radiation. Electromagnetic radiation can cause lens opacity, accelerate the aging process, and cause cataracts, which is irreversible organic damage, affecting vision and even blindness.
Baidu encyclopedia-radiation
Baidu encyclopedia-radiation