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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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One thing that Telegram now offers to all users is the ability to “disappear” messages or set remote deletion deadlines. That enables users to have much more control over how long people can access what you’re sending them. Given that Russian law enforcement officials are reportedly (via Insider) stopping people in the street and demanding to read their text messages, this could be vital to protect individuals from reprisals. "The inflation fire was already hot and now with war-driven inflation added to the mix, it will grow even hotter, setting off a scramble by the world’s central banks to pull back their stimulus earlier than expected," Chris Rupkey, chief economist at FWDBONDS, wrote in an email. "A spike in inflation rates has preceded economic recessions historically and this time prices have soared to levels that once again pose a threat to growth." And indeed, volatility has been a hallmark of the market environment so far in 2022, with the S&P 500 still down more than 10% for the year-to-date after first sliding into a correction last month. The CBOE Volatility Index, or VIX, has held at a lofty level of more than 30. Groups are also not fully encrypted, end-to-end. This includes private groups. Private groups cannot be seen by other Telegram users, but Telegram itself can see the groups and all of the communications that you have in them. All of the same risks and warnings about channels can be applied to groups. On February 27th, Durov posted that Channels were becoming a source of unverified information and that the company lacks the ability to check on their veracity. He urged users to be mistrustful of the things shared on Channels, and initially threatened to block the feature in the countries involved for the length of the war, saying that he didn’t want Telegram to be used to aggravate conflict or incite ethnic hatred. He did, however, walk back this plan when it became clear that they had also become a vital communications tool for Ukrainian officials and citizens to help coordinate their resistance and evacuations.
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