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Very small gold rods (1mm x 5mm) are often used as position markers in stereotaxic radiation therapy / surgery, e.g. with the TrueBeam and
Cyberknife systems. Several of these markers are implanted very near (but not inside of) the targeted tumor during minimal-invasive minor surgery. Since gold is impermeable to X-rays, the rods' strong shadow helps the CT-based control system automatically detect and exactly measure breathing-related movements of the patient's torso, up to 8-12 times per second.
During breathing in/out, the
LINAC delivering therapeutical electron-beam or gamma-photon dosage can be gated (blocked) for gantry-based devices or modulated (continously adjusted in position) for the KuKA robotic arm mounted Cyberknife system.
The gold markers are usually removed after treatment - that's why they cannot be placed inside of the tumor proper, since their retraction could result in removal and dispersion of some cancer cells within the body.
94.21.160.79 (
talk) 17:36, 30 June 2023 (UTC)reply
I'm not immediately sure where this would fit but it would need a high-quality source to support it before we could use it, as it is medical information. See
Wikipedia:Identifying reliable sources (medicine)/FAQ. Don't worry about pretty formatting, anybody can do that: the hard part is finding the reliable evidence. --
𝕁𝕄𝔽 (
talk) 18:24, 30 June 2023 (UTC)reply
Fiducial markers are used in positioning and imaging across a range of medical contexts, and come in a variety of shapes and materials depending on the particular application. Some are small rods, some are rods or beads connected by a linker, some are coils, some are tiny beads implanted in bone. Some are left in place permanently and some are intended to be removed. Many are gold or gold-alloy based, but there are also polymer and carbon markers. In some cases, gold's strong x-ray shadow is a drawback rather than a benefit--while it provides high contrast in portal imaging systems, it can also introduce artifacts in CT scans and distortions in MR imaging.
Gold not reacting with KOH/NaOH in solution or molten state can be debated, typical etching with KOH will take time, visible in nano scales.
Semi-protected edit request on 20 September 2023
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edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request.
It is wrong I will Chang every IT to wright way
188.141.118.225 (
talk) 18:19, 20 September 2023 (UTC)reply
Not done: it's not clear what changes you want to be made. Please mention the specific changes in a
"change X to Y" format and provide a
reliable source if appropriate.
RudolfRed (
talk) 18:41, 20 September 2023 (UTC)reply
Semi-protected edit request on 22 September 2023
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edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request.
Change from parentheses (") to {{
gloss}}, to clarify the "Etymology" section.
112.205.179.117 (
talk) 12:22, 22 September 2023 (UTC)reply
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edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request.
I would like to add the following information to the "Pollution" section, which is listed under the "Environmental Impact" in other metals page (eg
/info/en/?search=Copper#Environmental_impacts):
The estimated impact of gold mining on global warming was 12.5 tCO2eq per kg of gold in 2019[1]. By 2020, the BBC reported an increase to 16 tCO2eq per kg of gold[2].
Research111 (
talk) 10:19, 20 October 2023 (UTC)reply
It's incorrect. The word "gold" does not come from "aurum". It is Germanic.
Grassynoel (
talk) 21:54, 24 January 2024 (UTC)reply
Semi-protected edit request on 22 March 2024
Typo fix required:
This article is protected, so I can't fix it, so someone else will have to (I suppose if you like you could delete this note afterward, I don't know if that is customary). Anyway, in the section Chemistry/Rare oxidation states, the last sentence of the fourth paragraph: "It has been shown to unexpectedly stable at normal conditions" obviously should read "to be". I hate it when I find this sort of stuff in wiki articles, and fix them when I can.
2001:56A:F0E9:9B00:68D5:5DEB:2E68:F861 (
talk) 01:04, 23 March 2024 (UTC)JustSomeWikiReaderreply
Fixed Thanks for noticing, and fixing or reporting these sorts of things as you are able!
DMacks (
talk) 03:59, 23 March 2024 (UTC)reply
Chemical reactivity in gaseous compounds
Although solid metallic Au is very unreactive, the opposite is true of gaseous gold. It very readily forms compounds with well over half the periodic table.
Some 40 years ago my DPhil research concerned the spectroscopy of the diatomic molecules CeO and Cu2. I learned then that more AuX compounds had been characterized with an element X other than, perhaps, oxygen which forms XO molecules. Hydrogen, forming HX, came a distant third.
If a sub-topic about this is decided to be worthwhile, I will try to dig up appropriate references and write the text.
Xilman (
talk) 16:39, 24 March 2024 (UTC)reply
Hi
User:Xilman. I think content about that sort of topic would definitely be worth having. It's on-topic and seemingly not mentioned in the article we have now. And it's such a contrast to its behavior in the solid state (and the "common knowlege" based on it). I haven't looked at gold chemistry in many years so I don't know any of the current literature.
DMacks (
talk) 20:22, 24 March 2024 (UTC)reply
Hi
Xilman: I see that there is also an article called
Gold compounds that was created
here in 2022 as a copy of the
Gold#Chemistry section, and it remains nearly word-for-word identical in both articles. Ideally Gold compounds would be the in-depth article, with a summary here at Gold. Please add AuX information where you think it makes sense and I'd be glad to help organize. –
MadeOfAtoms (
talk) 04:23, 25 March 2024 (UTC)reply
Good idea. The sub-heading might be something simple like "Gaseous compounds".
Xilman (
talk) 15:20, 25 March 2024 (UTC)reply