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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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"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. The Security Service of Ukraine said in a tweet that it was able to effectively target Russian convoys near Kyiv because of messages sent to an official Telegram bot account called "STOP Russian War." These entities are reportedly operating nine Telegram channels with more than five million subscribers to whom they were making recommendations on selected listed scrips. Such recommendations induced the investors to deal in the said scrips, thereby creating artificial volume and price rise. Telegram, which does little policing of its content, has also became a hub for Russian propaganda and misinformation. Many pro-Kremlin channels have become popular, alongside accounts of journalists and other independent observers. Telegram has become more interventionist over time, and has steadily increased its efforts to shut down these accounts. But this has also meant that the company has also engaged with lawmakers more generally, although it maintains that it doesn’t do so willingly. For instance, in September 2021, Telegram reportedly blocked a chat bot in support of (Putin critic) Alexei Navalny during Russia’s most recent parliamentary elections. Pavel Durov was quoted at the time saying that the company was obliged to follow a “legitimate” law of the land. He added that as Apple and Google both follow the law, to violate it would give both platforms a reason to boot the messenger from its stores.
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