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Как откалибровать гамма-спектрометр в домашних условиях?
Можно заказать с Озона вольфрам-ториевый электрод для сварки WT-20 или WT-30. Там радиоактивный торий-232, которого хоть и мало, но продукты его распада производят характерные пики в самом широком диапазоне энергий. Если набирать спектр пару-тройку дней, получается вполне неплохо. Можно взять для калибровки пики 65 кэВ, 583 кэВ и 2614 кэВ.
Период полураспада тория-232 больше 14 миллиардов лет, так что электрода хватит надолго.



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Как откалибровать гамма-спектрометр в домашних условиях?
Можно заказать с Озона вольфрам-ториевый электрод для сварки WT-20 или WT-30. Там радиоактивный торий-232, которого хоть и мало, но продукты его распада производят характерные пики в самом широком диапазоне энергий. Если набирать спектр пару-тройку дней, получается вполне неплохо. Можно взять для калибровки пики 65 кэВ, 583 кэВ и 2614 кэВ.
Период полураспада тория-232 больше 14 миллиардов лет, так что электрода хватит надолго.

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Telegram was co-founded by Pavel and Nikolai Durov, the brothers who had previously created VKontakte. VK is Russia’s equivalent of Facebook, a social network used for public and private messaging, audio and video sharing as well as online gaming. In January, SimpleWeb reported that VK was Russia’s fourth most-visited website, after Yandex, YouTube and Google’s Russian-language homepage. In 2016, Forbes’ Michael Solomon described Pavel Durov (pictured, below) as the “Mark Zuckerberg of Russia.” Despite Telegram's origins, its approach to users' security has privacy advocates worried. Overall, extreme levels of fear in the market seems to have morphed into something more resembling concern. For example, the Cboe Volatility Index fell from its 2022 peak of 36, which it hit Monday, to around 30 on Friday, a sign of easing tensions. Meanwhile, while the price of WTI crude oil slipped from Sunday’s multiyear high $130 of barrel to $109 a pop. Markets have been expecting heavy restrictions on Russian oil, some of which the U.S. has already imposed, and that would reduce the global supply and bring about even more burdensome inflation. Either way, Durov says that he withdrew his resignation but that he was ousted from his company anyway. Subsequently, control of the company was reportedly handed to oligarchs Alisher Usmanov and Igor Sechin, both allegedly close associates of Russian leader Vladimir Putin. "Someone posing as a Ukrainian citizen just joins the chat and starts spreading misinformation, or gathers data, like the location of shelters," Tsekhanovska said, noting how false messages have urged Ukrainians to turn off their phones at a specific time of night, citing cybersafety.
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