超声波对人体的危害?

2025-03-11 11:15:41
推荐回答(3个)
回答1:


剂量
超声是潜在的致癌与致
畸形
因素,而且不同
频率
、不同
声强
对不同
个体
有一定危害。因为
超声波
对固体和
液体
都有很强的穿透本领,
能量
较大时可以使物质
微粒
作高频振动,部分能量还可以转变为
热能
,使
局部
温度升高。高强度的
脉冲
超声波在含有微米级小
气泡
的液体中传播时,可导致气泡收缩、膨胀以至猛烈爆炸,这种现象称为“空化现象”。不久前美国著名超
生物物理
专家卡斯坦森指出,某些临床使用的超声
图像
诊断仪的最大输出
强度
已达1千瓦/平方厘米,这个强度足以使
生物体
产生
瞬态
空化现象。对生物体来说,瞬态
空化作用
时,靠近
爆炸气泡
附近的
细胞
会受到损伤,一般说来,在人体内大多数
器官
和生物流体中,损伤少量细胞不会对人体产生危害

回答2:

回答3:

人长期受到超声的影响,会引起人体组织轻微的发热;当频率更高时,发热就会越发厉害,使人体内水分子被烧,周围的组织遭到破坏,长时间如此就有危险。因此大功率高强度的超声波持续作用于人体是有害的;小功率超声波间歇作用于人体却是有益的。就相当于有人给你轻轻捶背你会感到舒服,但重击你时你会感到疼痛甚至是伤害。

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