首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
If you’ve traveled by airplane in the past few years, chances are you’ve walked through a full body scanner at the security chec
If you’ve traveled by airplane in the past few years, chances are you’ve walked through a full body scanner at the security chec
admin
2022-02-03
77
问题
If you’ve traveled by airplane in the past few years, chances are you’ve walked through a full body scanner at the security checkpoint.
The first generation of full body X-ray scanners rolled out in airports across the US in 2008. Known as backsatter scanners, there was a bit of an uproar from consumers when these came on the scene. Fliers feared the imaging would visually strip them of their clothes in front of the Transportation Security Administration (TSA) agents. Some health experts also worried that these models might expose people to unnecessary radiation.
But in 2013, the TSA replaced backscatter scanners with new-and-improved scanners, called millimeter wave screeners. They fixed the "see you naked"issue. These devices create a standard outline of a person, rather than a detailed image of the person’s body. They’re also an improvement for your health. The millimeter wave scanners use low power radio frequency waves to create the image. The frequency is the same as that used for Wi-Fi devices. If you stood for three seconds in a scanner, it would be no more radiation exposure than standing in front of your computer router at home.
Backscatter scanners, meanwhile, can still be found in other places like jails and courthouses. They do expose people to small amounts of X-rays, but the Food and Drug Administration (FDA) considers them safe. A person receives more radiation from naturally occurring sources in less than an hour of ordinary living than from one screening with any general-use X-ray security system, says the FDA. Yet others are not so convinced.
The European Union prohibits the backscatters. Some scientists believe that even very low level X-ray exposure could increase the risk of cancer. " I would agree that the individual risk associated with X-ray scanners is likely to be extremely small," says David Brenner, head of Columbia University’s Center for Radiological Research. "The issue of concern is when the X-ray scanners are used in a very high volume setting (just under a billion security screens occur each year in US airports). A very tiny risk multiplied by a billion has the potential to represent a public health issue. "
The FDA believes that the health risk of backscatter scanning________.
选项
A、will be lowered
B、can be tolerated
C、must be measured
D、should be avoided
答案
B
解析
推断题。文章第四段第二句话提到,反向散射扫描仪确实会使人暴露于少量X射线,但美国食品药品监督管理局认为它们是安全的。由此可知,美国食品药品监督管理局认为反向散射扫描仪所带来的健康风险是可以容忍的。
转载请注明原文地址:https://kaotiyun.com/show/OGNd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Asregardssocialconventions,wemustsayawordabouttheEnglishclasssystem.ThisisanembarrassingsubjectforEnglishpe
Asregardssocialconventions,wemustsayawordabouttheEnglishclasssystem.ThisisanembarrassingsubjectforEnglishpe
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchfindingofateamofJapanesedoctors,whosayt
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchfindingofateamofJapanesedoctors,whosayt
AnairofanxiousuncertaintyspreadthroughoutthesmallIndiancampasthesundawnedthatmorning.Somebravesgatheredbesid
Youhavereadthefollowingmagazineadvertisementinwhichacompanyislookingforasecretary.SecretaryNeededAtleas
Autonomousrobotsareabletomoveanddecidebythemselves.Atasimplelevel,thesecanincluderobotvacuumcleanersthat"de
Psychologiststakeoppositeviewsofhowexternalrewards,fromwarmpraisetocoldcash,affectmotivationandcreativity.Beha
Whopersuadedthemanintocoachingvolleyball?
WhatdoesthemansayaboutCatalina?
随机试题
简述建立公务员退休制度的意义。
女孩,13岁,洗澡时家人发现脊柱弯曲畸形,来医院就诊。经检查,患者诊断为特发性脊柱侧弯,cobB角为30°,该病人治疗应选择
龟甲的功效有
水闸安全类别划分中,()是运用指标达不到设计标准,工程存在严重损坏,经除险加固后,才能达到正常运行。
除基本工资以外,管理人员还可获得下列薪酬()。专业人员的薪酬方案设计可以采取如下方式()。
某企业采用实际成本法核算存货。年末结账后,该企业“原材料”科目借方余额为80万元。“工程物资”科目借方余额为16万元。“在途物资”科目借方余额为20万元。不考虑其他因素。该企业年末资产负债表“存货”项目的期末余额为()万元。(2017年)
四乐句乐段的“起承转合”中,一般结束在不稳定音上的是()句。
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是:
计算机的硬件主要包括:中央处理器(CPU)、存储器、输出设备和()。
A、 B、 C、 B
最新回复
(
0
)