Linked by Howard Fosdick on Fri 2nd Dec 2011 12:12 UTC
Privacy, Security, Encryption If you're modest, think twice before having sex in your van, truck, or RV. Law enforcement uses roving vans with backscatter X-ray technology to peer inside vehicles (the same technology used in airport body scanners). In the Land of the Free, authorities don't request search warrants. More at Forbes here and here. What, you don't want an X-ray bath?
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RE[2]: Radiation?
by Alfman on Fri 2nd Dec 2011 23:15 UTC in reply to "RE: Radiation?"
Alfman
Member since:
2011-01-28

Neolander,

"Well, spontaneously, I'd say that it depends on the x-ray dose. Ordinary radiography doses should remain pretty much harmless as long as exposure remains exceptional."

Well, as I understand it, it's not the quantity that matters, but rather the odds that any given x-ray photon interacts with our cellular dna to create a mutation. What are the odds that any given exposure results in a cancerous mutation? Non-cancerous cell mutations probably aren't harmful when the cells just die off on their own, but I'm not sure about non-cancerous mutations that don't kill off the cell.

Assume a cell C undergoes a series of exposures resulting in various mutations a,b,c. My question is, would the cell still have become cancerous without all the previous mutations?

C[ ] -> original cell
C[ a ] -> benign mutation
C[ a , b ] -> benign mutation
C[ a , b , c ] -> first cancer symptoms
C[ b ] -> cancerous?
C[ c ] -> cancerous?
C[ b , c ] -> cancerous?
C[ a , c ] -> cancerous?

If any of the later 4 above are cancerous, it suggests a coincidence that the prior mutations did not result in cancer. If a cell has equal risk of contracting cancer at each exposure, then it places doubt on the common medical notion that x-rays are ok as long as they're infrequent.

If we could digitally test a cell's DNS for traces of cancer characteristics, then we could mathematically prove correlations between multiple mutations and cancer, I wonder if anyone's attempted it.

Edit: fix osnews formatting

Edited 2011-12-02 23:19 UTC

Reply Parent Score: 2

RE[3]: Radiation?
by Kivada on Sat 3rd Dec 2011 06:59 in reply to "RE[2]: Radiation?"
Kivada Member since:
2010-07-07

All radiation has the potential to cause cancer, the problem is it's impossible shield yourself from all radiation since you need things like potassium which are radioactive.

What they mean by "medically safe" is exactly that, in medicine you often have to cause wounds or poisonous materials to extend someone's life and/or improve their quality of life and thus will have to weigh your options for say:

Give them an X-ray and maybe in 20 years they'll die from cancer caused from it or save their arm and possibly their life(infection can set in) doing the X-Ray to see how we can repair this spiral fracture.

You make these kinds of decisions all day every day without ever noticing them, but with things like radiation exposure we have other options in most cases that are preferable to the radiation like Geothermal, Solarthermal and Wind power over nuclear or coal(contains uranium among other nasties) due to how dangerous and ridiculously hard to clean up and dispose of material and the fact that when shit goes bad it goes incredibly bad. Google coal slurry disaster and mountain top removal disaster. Neither gets any media coverage due to where they happen and the fact that every news network runs ads for "clean coal technology"...

Reply Parent Score: 2

RE[3]: Radiation?
by Gone fishing on Sat 3rd Dec 2011 08:28 in reply to "RE[2]: Radiation?"
Gone fishing Member since:
2006-02-22

I'm not an expert here but most oncer genes are mutated growth regulatory genes which do not function in growth regulation as they should.

We can conclude therefore that any damage to a growth regulatory gene could result in a cancer i.e any exposure to ionizing radiation could result in cancer. However, many systems have several fail-safes so that if one system of control fails then another is in place. You can imagine - cell growth being inhibited by the presence of a certain grow regulator substance, then by contact with other cells etc. In this case cumulative exposure and cumulative damage will certainly increase the risk of a cell becoming cancerous by progressively knocking out more regulatory systems.

Reply Parent Score: 2