Talk:Cargo scanning
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passive radiation detectors
editI changed the previous statement that nuclear materials emit a lot of gamma photons, because there are nuclear materials such as U235 that do not emit a lot of photons. Furthermore, I corrected the word "false" alarms where in fact "nuisance" alarms were referred to. The former term is used to express an alarm occurring for statistical reasons when no radiation source is present, the latter indicating that radiation (in this case from NORM) is in fact present and correctly detected by the RPM but incorrectly assumed to be a threat. I tried expanding the section as requested. User:Unkenruf 15 January 2010
External links modified
editHello fellow Wikipedians,
I have just modified 5 external links on Cargo scanning. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
- Added archive https://web.archive.org/web/20071009143647/http://www.usacc.org/content.php?id=2713&type=news to http://www.usacc.org/content.php?id=2713&type=news
- Added archive https://web.archive.org/web/20070927014213/http://www.saic.com/products/security/mobile-vacis/mobile-tech.html to http://www.saic.com/products/security/mobile-vacis/mobile-tech.html
- Added archive https://web.archive.org/web/20071009032119/http://www.saic.com/products/security/vacis-p/ to http://www.saic.com/products/security/vacis-p/
- Added archive https://web.archive.org/web/20151121191019/http://phys.org:80/news/2005-02-muons-hidden-pyramid-chambers.html to http://phys.org/news/2005-02-muons-hidden-pyramid-chambers.html/
- Added archive https://web.archive.org/web/20071009061733/http://www.saic.com/products/security/at-980/ to http://www.saic.com/products/security/at-980/
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X-rays vs Gamma-rays!
editDear all,
In the Gamma-Ray section photon energy is given as 1.25MeV whereas in x-Ray section photon energy is given as starting from 5 MeV! But Gamma rays are -by definition- more energetic than X-rays! Is there some kind of error? — Preceding unsigned comment added by 85.73.96.76 (talk) 22:07, 10 May 2020 (UTC)
- Bremsstrahlung photons aren't monoenergetic, but instead span an energy spectrum, so it is a mix of both X-rays and gammas rays and everything in between (it is a continuum, after all). So while the section header isn't totally wrong, it is a bit misleading. After all, it is the high energy photons (i.e. gammas) in the bremsstrahlung spectrum that enables the stronger penetration. Unfortunately, literature tends to use X-radiography and gamma-radiography interchangeably, so there isn't a clear standard. Paydah (talk) 16:06, 30 March 2022 (UTC)