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[考试辅导] 医学考博每日一读:

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发表于 2012-7-20 22:52:00 | 显示全部楼层 |阅读模式
医学考博每日一读:'No evidence' of harm by mobiles: k6 s7 w( l% b  L  r. @0 w! t
There is still no evidence mobile phones harm human health, says a major safety review for the UK's Health Protection Agency (HPA).- D( Q, q2 r  J) t) S* }
Scientists looked at hundreds of studies of mobile exposure and found no conclusive links to cancer risk, brain function or infertility.
& }3 i1 i; V- z. GHowever, they said monitoring should continue because little was known about long-term effects.
7 @7 A. D) k. u9 a7 B" g; ^. h, qThe HPA said children should still avoid excessive use of mobiles.  u" d6 l9 V/ s' d6 f
It is the biggest ever review of the evidence surrounding the safety of mobile phones.
* k1 n: ~+ R* T% F! `: s7 FThere are now an estimated 80 million mobiles in the UK, and because of TV and radio broadcasting, Wi-Fi, and other technological developments, the study said exposure to low-level radio frequency fields was almost universal and continuous.- D; \; O/ t: T0 }9 G. e' R4 U
A group of experts working for the HPA looked at all significant research into the effects of low-level radio frequency. 2 p8 [1 J0 x  v
'Relatively reassuring' " j4 H) \& [0 _, X8 K% [
They concluded that people who were not exposed above UK guideline levels did not experience any detectable symptoms.
- c, w% v+ C+ z  k. C1 E+ ?That included people who reported being sensitive to radio frequency. ) V0 W0 G* j/ i: o
They also said there was no evidence that exposure caused brain tumours, other types of cancer, or harm to fertility or cardiovascular health.
! q5 S' X% V- W& oBut they said very little was known about risks beyond 15 years, because most people did not use mobile phones until the late 1990s.
; C$ B* Q: o# N6 N) b1 RProf Anthony Swerdlow, who chaired the review group, said it was important to continue monitoring research.
5 a' ^! @2 H. f"Even though it's relatively reassuring, I also think it's important that we keep an eye on the rates of brain tumours and other cancers," he said.
" u6 S) d" \; ~$ }"One can't know what the long-term consequences are of something that has been around for only a short period."2 }8 X; }) N3 f, L) B: R2 m+ N
There has been speculation about the health effects of using mobile phones for years.
- O1 @! M! D; YThe HPA conducted a previous review in 2003, which also concluded that there was no evidence of harm. But there is now far more research into the subject. 9 Y/ J7 H, T1 U0 j: k) S$ h9 O
Advice on children5 Q. T7 g* X8 g
The experts said more work was needed on the effect of radio frequency fields on brain activity, and on the possible association with behavioural problems in children.
% h. g2 s2 K+ R& LThey also called for more investigation into the effects of new technology which emits radio frequency, such as smart meters in homes and airport security scanners.
5 N9 H) a2 V  CThe HPA said it was not changing its advice about mobile phone use by children.9 S1 y6 s" v5 |
"As this is a relatively new technology, the HPA will continue to advise a precautionary approach," said Dr John Cooper, director of the HPA's centre for radiation, chemical and environmental hazards.
+ ?( i1 l3 E; @, j/ V- f/ ^/ n"The HPA recommends that excessive use of mobile phones by children should be discouraged.": @' o% G! F/ e- z: b* h
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& ?. H! N. N( q0 ^& W2013医学考博英语真题必备+ O+ M1 e4 z3 A* R- Z  Y
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