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Once you have located and activated the exposure compensation function, you will see the available settings on your camera's LCD screen. The settings will be shown in a format similar to the numbers below. +2 Those numbers represent full steps for exposure compensation but you wont always need to make full step. Search the world's largest video collection plus millions of music tracks, sound effects, motion graphics and images. Over 20,000 new videos added daily. Find the perfect media for your next creative project. The maximum exposure at any location was 0.00083 mW/cm2. Typical power densities were less than 0.00001 mW/cm2. This is less than 0.01% of the ICNIRP public exposure guidelines. When RF radiation from all sources was taken into account, the maximum power density at any site was less than 0.2% of the ICNIRP public exposure guidelines.
Radiation exposure levels compared.Click image for graphic
As radiation exposure around the Fukushima nuclear power plant reach levels of 400mSv per hour (although they've since gone down), we thought it was time to put the figures into perspective.
Radiation is all around us, all the time. But what level does it have to get to before it becomes really dangerous?
The World Nuclear Association (which represents the 'global nuclear profession') does have a guide. Back in time 5 1 1. And while there is a touch of Smilin' Joe Fission, it is a good place to start for a useful primer.
There are different kinds of radiation - which you can read about in the WNA guide. The problems we're concerned about come from ionising radiation.
Radiation dosages are measured in sieverts - but because these are so big we're talking about millisieverts mSv (a thousandth of a sievert). Rather than being an exact unit of size (because different types of radiation have different effects) an mSv measures the effective radiation dose. According to the WNA, each mSv of radiation 'produces the same biological effect'.
We're exposed to radiation when we fly and when we get medical treatment - and whenever we leave the house. But the large dosages can have dramatic effects.
It has been known for many years that large doses of ionising radiation, very much larger than background levels, can cause a measurable increase in cancers and leukemias ('cancer of the blood') after some years delay. It must also be assumed, because of experiments on plants and animals, that ionising radiation can also cause genetic mutations that affect future generations, although there has been no evidence of radiation-induced mutation in humans. At very high levels, radiation can cause sickness and death within weeks of exposure
So, how high are levels in Japan? @mariansteinbach has been crowdsourcing the levels recorded at monitoring stations across Japan from the the official nuclear monitoring site here. Here are the results (in Grays, which are a unit of size, not of the effective dose received by people in the area). The users have also been monitoring a Geiger counter in Tokyo too (and here's how to read a Geiger counter).
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So, how do the levels compare? We've accumulated information from the WNA, news agency reports and medical info site Radiologyinfo.org. Code 27535.
Data summary
Radiation reading, millisievert (mSv) | |
---|---|
Single dose, fatal within weeks | 10,000.00 |
Typical dosage recorded in those Chernobyl workers who died within a month | 6,000.00 |
Single does which would kill half of those exposed to it within a month | 5,000.00 |
Single dosage which would cause radiation sickness, including nausea, lower white blood cell count. Not fatal | 1,000.00 |
Accumulated dosage estimated to cause a fatal cancer many years later in 5% of people | 1,000.00 |
Max radiation levels recorded at Fukushima plant yesterday, per hour | 400.00 |
Exposure of Chernobyl residents who were relocated after the blast in 1986 | 350.00 |
Recommended limit for radiation workers every five years | 100.00 |
Lowest annual dose at which any increase in cancer is clearly evident | 100.00 |
CT scan: heart | 16.00 |
CT scan: abdomen & pelvis | 15.00 |
Dose in full-body CT scan | 10.00 |
Airline crew flying New York to Tokyo polar route, annual exposure | 9.00 |
Natural radiation we're all exposed to, per year | 2.00 |
CT scan: head | 2.00 |
Spine x-ray | 1.50 |
Radiation per hour detected at Fukushimia site, 12 March | 1.02 |
Mammogram breast x-ray | 0.40 |
Chest x-ray | 0.10 |
Dental x-ray | 0.01 |
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