Tagged Questions

Ionizing electromagnetic waves, usually harmful to most biological beings.

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Any benefit to low dose radiation?

Is there any survival benefit in humans that can be obtained from chronic exposure to low dose radiation, or is any dose of radiation a potential harm? Has any research been done into this?
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1answer
113 views

Is excessive hydration a risk factor for cancer in humans?

I was reading a book on radiation biology, and the book describes the process of "indirect action", where radiation can first ionize a water molecule forming a free radical, which then may interact ...
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2answers
328 views

Can we determine a person's age by dating methods or other means?

There are many sports restricted to players of a certain age (e.g. 16 and under, 18 and under, etc.) What if a person is older and fakes his birth certificate to say that he is younger? Is there any ...
3
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2answers
54 views

Can radiation equilevant to 1 CT (computer tomography) scan causes significant changes in human body?

I've read that CT scan causes radiation equivalent to few hundreds of ordinary X ray scan. It sound scary at the first look of it but I wonder is it the amount considered significant? Can dosage equal ...
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1answer
28 views

How well understood are the long-term effects of nuclear radiation?

Sometimes, when people are concerned about radiation, it is not because it is precisely quantified how dangerous it is, but because we don't know how dangerous it is. How well understood are the ...
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1answer
62 views

Hair loss in a submarine?

Biologically, how critical is hair loss on a submarine? What is the prolonged exposure of a navy officer going to do to that person, say over a year or even more?
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1answer
28 views

DNA Fingerprint

I recently came across an article indicating that the half life of DNA in the most ideal situations is 521 years (http://www.nature.com/news/dna-has-a-521-year-half-life-1.11555). However, since ...
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0answers
57 views

Is WIFI safe for humans? [closed]

I have wifi on at my home almost all the time. I learned that the frequency of visible light is around several hundreds of THz, while the frequency of wifi is only several GHz, which is only ...
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1answer
36 views

Reverse tomography to create 3D scalpel

Isn't it possible to reverse tomography methods to create means to deliver heat or radiation precisely in 3D? This would be "3D scalpel" i.e. device which would be able to eradicate tumor cells ...
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0answers
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Is a single x-ray photon capable of doing enough damage to the dna of a cell to kill that cell?

Ionizing radiation is damaging to DNA, but is there such a thing as a safe dose below which no DNA damage could occur? I'm not asking about a minimum safe dose overall, just whether or not there's an ...
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2answers
141 views

Radiation and “Safe Dose”

I've read about safe doses of radiation, briefly. Why is there such a thing a safe dose? Can't any radiation give you cancer? Why is it more and more dangerous to take in larger and larger doses? Just ...
2
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2answers
104 views

Difference between Medical and Airport scanner radiation

What is the difference between radiation doses of a medical scanner and airport security scanner (X-Ray full body scan)? Is it the same kind of radiation? Does it pose any danger for people who fly ...
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1answer
131 views

Why does radiation sickness cause hair to fall out?

As I understand it, radiation poisoning (acute radiation syndrome) is fatal because the radiation kills cells. However, why do victims experience hair loss at such an early stage in the process?
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1answer
135 views

Why are women more susceptible to radiation?

The answer to this question on the Space.SE indicates women are more susceptible to radiation in space than men. Why is this the case? Is it merely that women have less muscle mass (which being ...
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0answers
48 views

What are the effects of excessive UV exposure on the human immune system?

In my readings, several authors have suggested that excessive/prolonged exposure to UV (particularly UVA) can have harmful long term effects on the human immune system. This leads to my question, ...
4
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1answer
42 views

Are there any studies on the fertility levels of humans/mammals as a function of their stay at Antarctica?

Wikipedia, and Space.SE seem to indicate humans become infertile in space due to the increased exposure to cosmic rays. Knowing as we do that Antarctica is holey, and subject to increased radiation ...
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1answer
67 views

Aside from cockroaches and other insects, which species (of all kinds) are 'immune' to ionizing radiation?

I have just been reading this excellent question and answer about cockroaches ability to withstand ionizing radiation. My question is an extension of that question: aside from insects, which other ...
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0answers
73 views

What material is recommended for autoradiography cassettes when working with 32P?

So, during radiation safety training, much hullabaloo is made regarding how the high energy beta emitted by 32P produces Bremsstrahlung radiation when striking a high Z shielding material. As such, ...
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1answer
416 views

How is the effective dose calculated when only part of the body is irradiated?

For calculating the effective radiation dose in Sv, the equivalent dose absorbed by each body part is averaged according to tissue-specific weighting factors, which sum up to 1. If not the whole body ...
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1answer
432 views

What is the modern state of the theory of evolution?

When I studied biology at my medical school we used to learn things about a century old: the famous Darwin's voyage on "Beagle" to the Galapagos Islands, the classical triad of his Theory of ...
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2answers
1k views

How do cockroaches resist the effects of ionizing radiation?

Cockroaches are very hardy insects. It is known that, among other things, they are able to withstand bursts of ionizing radiation that would kill a human being. The explanations of this observed ...