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Возможности этого металла уникальны, а области применения довольно обширны. Используется как мощный источник нейтронов в нейтронно-активационном анализе, в экспериментах по изучению спонтанного деления ядер, применяется в медицине для обработки злокачественных опухолей, там, где другие методы лучевой терапии бессильны. Применяется он и для дефектоскопии, обнаруживает дефекты, например, в реакторах, деталях самолётов и других дорогостоящих и критичных конструкциях, где эти дефекты не обнаруживаются рентгеновскими лучами. Калифорниевые нейтроны подходят и для разведки нефтяных пластов – нейтронного каротажа, т. е. в геологоразведке и добыче полезных ископаемых. Благодаря испусканию мощного потока нейтронов Калифорний находит применение в сталелитейной, химической, нефтеперерабатывающей, угледобывающей промышленности; в ядерной энергетике и авиационно-космической технике; применяется для производства компонентов ядерного оружия (ядерные и термоядерные заряды малой мощности).

 Предлагаю Вашему вниманию интересную статью об экскурсии на предприятие, на котором производят этот удивительный металл. 

Где и как делают самый дорогой металл в мире

18 апреля 2016 г.

     Автор: alexio_marziano

Если вы думаете, что золото с платиной являются самыми ценными металлами на планете, то вы ошибаетесь. По сравнению с некоторыми искусственно полученными металлами, стоимость золота можно сравнить со стоимостью ржавчины на старом куске кровельного железа. Вы можете представить себе цену в 27 000 000 долларов США за один грамм вещества? Именно столько стоит радиоактивный элемент Калифорний-252. Дороже только антиматерия, которая является самой дорогой субстанцией в мире (около 60 триллионов долларов за грамм антиводорода).

На сегодняшний день в мире накоплено всего 8 грамм Калифорния-252, а ежегодно производится не более 40 миллиграмм. И на планете есть только 2 места, где его регулярно производят: в Окриджской национальной лаборатории в США и ... в Димитровграде, в Ульяновской области.

Хотите узнать, как появляется на свет почти самый дорогой материал в мире и для чего он нужен?

Димитровград

В 80 километрах от Ульяновска, на реке Черемшан, находится город Димитровград с населением около 100 000 человек. Его главное предприятие  — Научно-исследовательский институт атомных реакторов (НИИАР), который был создан в 1956 году по иницитиве Курчатова.  Изначально он был опытной станцией для испытаний ядерных реакторов, но в настоящее время спектр направлений деятельности значительно расширился. Сейчас в НИИАР испытывают различные материалы, чтобы определить, как они себя ведут в условиях продолжительного радиактивного излучения, создают радионуклидные источники и препараты, которые применяют в медицине и исследованиях, решают технические вопросы экологически чистых технологий и просто ведут научную деятельность. В НИИАР работает около 3500 сотрудников и 6 реакторов.

Светят, но не греют

Ни один из шести  «нииаровских» реакторов не используется как источник энергии и не отапливает город — тут вы не увидите гигантских установок на тысячи МВт. Главная задача этих «малышей» — создать максимальный по плотности поток нейтронов, которыми учёные института и бомбардируют различные мишени, создавая то, чего нет в природе.  Реакторы НИИАР работают по схеме «10/10» — десять день работы и 10 день отдыха, профилактики и перегрузки топлива. При таком режиме просто невозможно использовать их для нагрева воды. Да и максимальная температура теплоносителя, получаемая на выходе — всего 98 С, воду быстро охлаждают в небольших градирнях и пускают по кругу.

Самый Мощный

Из 6 реакторов есть один, самый любимый учёными НИИАР. Он же и самый первый. Он же и Самый Мощный, что и дало ему имя — СМ.  В 1961 году это был СМ-1, мощностью в 50 МВт, в 1965 после модернизации он стал СМ-2, в 1992 — СМ-3, эксплуатация которого рассчитана до 2017 года.  Это уникальный реактор и в мире он один такой. Его уникальность — в очень высокой плотности потока нейтронов, который он способен создавать. Именно нейтроны и являются основной продукцией НИИАР. С помощью нейтронов можно решать много задач по исследованию материалов и созданию полезных  изотопов. И даже воплощать в жизнь мечту средневековых алхимиков — превращать свинец в золото (теоретически).

Если не вдаваться в подробности, то процесс очень прост — берётся одно вещество и обстреливается со всех сторон нейтронами. Так, к примеру, из урана путём дробления его ядер нейтронами можно получить более лёгкие элементы: йод, стронций, молибден, ксенон и другие.

Ввод реактора СМ-1  в эксплуатацию и его успешная работа вызвали большой резонанс в научном мире, стимулировав, в частности, сооружение в США высокопоточных реакторов с жестким спектром нейтронов — HFBR (1964 год) и HFIR (1967 год). В НИИАР неоднократно приезжали светила ядерной физики, включая отца ядерной химии Гленна Сиборга, и перенимали опыт. Но всё же такой же по элегантности и простоте реактор так никто больше и не создал.

Реактор СМ до гениальности прост. Его активная зона — это почти кубик в 42 x 42 x 35  см. Но выделяемая мощность этого кубика — 100 мегаватт!  Вокруг активной зоны в специальных каналах устанавливают трубки с различными веществами, которые необходимо обстрелять нейтронами.

К примеру, совсем недавно из реактора вытащили колбу с иридием, из которого получили нужный изотоп. Теперь она висит и остывает.

После этого, маленькую ёмкость с теперь уже радиоактивным иридием погрузят в специальный защитный свинцовый контейнер, весом в несколько тонн и отправят на автомобиле заказчику.

Отработанное топливо (всего несколько грамм) потом тоже остудят, законсервируют в свинцовую бочку и отправят в радиоактивное хранилище на территории института на длительное хранение.

Голубой бассейн

В этом зале не один реактор. Рядом с СМ находится и другой — РБТ — реактор бассейнового типа, который работает с ним в паре. Дело в том что в реакторе СМ топливо «выгорает» всего наполовину. Поэтому его нужно «дожечь» в РБТ.

Вообще, РБТ удивительный ректор, внутрь которого можно даже заглянуть (нам не дали). Он не имеет привычного толстого стального и бетонного корпуса, а для защиты от радиации он просто помещен в огромный бассейн с водой (отсюда и название). Толща воды удерживает активные частицы, тормозя их. При этом частицы, движущиеся со скоростью, превышающей фазовую скорость света в среде, вызывают знакомое многим по фильмам голубоватое свечение. Этот эффект носит название учёных, которые его описали — Вавилова — Черенкова.


(фото не имеет отношения к реактору РБТ или НИИАР и демонстрирует эффект Вавилова-Черенкова)

Запах грозы

Запах реакторного зала не спутать ни с чем. Здесь сильно пахнет озоном, как после грозы. Воздух ионизируется при перегрузке, когда отработавшие сборки достают и перемещают в бассейн для охлаждения. Молекула кислорода О2 превращается в О3. Кстати, озон пахнет совсем не свежестью, а больше похож на хлор и такой же едкий. При высокой концентрации озона вы будете чихать и кашлять, а потом умрёте. Он отнесён к первому, самому высокому классу опасности вредных веществ.

Радиационный фон в зале в этот момент повышается, но и людей здесь нет — все автоматизировано и оператор наблюдает за процессом через специальное окно.   Однако, даже после этого к перилам в зале без перчаток прикасаться не стоит — можно подхватить радиоактивную грязь.

Мойте руки, перед и зад

Но уйти домой с ней  вам не дадут — на выходе из «грязной зоны» всех обязательно проверяют детектором бэта-излучения и в случае обнаружения вы вместе со своей одеждой отправитесь в реактор в качестве топлива. Шутка.

Но руки в любом случае нужно мыть с мылом после посещения любых подобных зон.

Сменить пол

Коридоры и лестницы в реакторном корпусе застелены специальным толстым линолеумом, края которого загнуты на стены. Это нужно для того, чтобы в случае радиоактивного загрязнения можно  было бы не утилизировать всё здание целиком, а просто скатать линолеум и постелить новый.  Чистота тут почти как в операционной, ведь наибольшую опасность представляет здесь пыль и грязь, которая может попасть на одежду, кожу и внутрь организма — альфа и бэта-частицы не могут улететь далеко, но при ближнем воздействии они как пушечные ядра, и живым клеткам точно не поздоровится.

Пульт с красной кнопкой

Зал управления реактором.

Сам пульт производит впечатление глубоко устаревшего, но зачем менять то, что спроектировано на долгие годы работы? Важнее всего то, что за щитами, а там все новое. Всё же многие датчики были переведены с самописцев на электронные табло, и даже программные системы, которые, кстати, в НИИАР и разрабатываются.

Каждый реактор имеет множество независимых степеней защиты, поэтому «фукусимы» тут не может быть в принципе. А что касается «чернобыля» — не те мощности, тут работают «карманные» реакторы. Наибольшую опасность представляют выбросы некоторых лёгких изотопов в атмосферу, но и этому не дадут случиться, как нас уверяют.

Физики-ядерщики

Физики института — фанаты своего дела и могут часами интересно рассказывать о своей работе и реакторах. Отведённого на вопросы часа не хватило и беседа растянулась на два нескучных часа. По-моему, нет такого человека, которому не была бы интересна ядерная физика 🙂 А директору отделения «Реакторный исследовательский комплекс» Петелину Алексею Леонидовичу с главным инженером впору вести научно-популярные передачи на тему устройства ядерных реакторов 🙂

Если за пределами НИИАР вы будете заправлять штаны в носки, то, скорее всего, вас кто-то сфотографирует и выложит в сеть, чтобы посмеяться. Однако здесь это необходимость. Попробуйте сами догадаться, почему.

Welcome to the hotel Californium

Теперь о Калифорнии-252 и зачем он нужен.   Я уже рассказывал о высокопоточном нейтронном реакторе СМ и его пользе. Теперь представьте, что та энергия, которую вырабатывает целый реактор СМ, может дать всего лишь один грамм (!) Калифорния.

Калифорний-252 – мощный источник нейтронов, что позволяет использовать его для обработки злокачественных опухолей, где другая лучевая терапия бездейственна. Уникальный металл позволяет просвечивать части реакторов, детали самолетов, и обнаруживать повреждения, которые обычно тщательно скрываются от рентгеновских лучей. С его помощью удается находить запасы золота, серебра и месторождения нефти в недрах земли.   Потребность в нём в мире очень велика, и заказчики порою вынуждены стоять годами в очереди за вожделённым микрограммом Калифорния!    А всё потому, что производство этого металла занимает... годы. Для производства одного грамма Калифорния-252, плутоний или кюрий подвергают длительному нейтронному облучению в ядерном реакторе, в течение 8 и 1.5 лет соответственно, последовательными превращениями проходя практически всю линейку трансурановых элементов таблицы Менделеева.  На этом процесс не заканчивается -  из получившихся продуктов облучения химическим путем долгими месяцами выделяют сам калифорний. Это очень и очень кропотливая работа, которая не прощает спешки. Микрограммы металла собирают буквально по атомам.   Этим и объясняется такая высокая цена.

Кстати, критическая масса металлического Калифорния-252 составляет всего 5 кг (для металлического шара), а в виде водных растворах солей — 10 грамм (!), что позволяет его использовать в миниатюрных ядерных бомбах. Однако, как я уже писал, в мире пока есть только 8 грамм  и использовать его в качестве бомбы было бы очень расточительно 🙂 Да и вот беда, через 2 года от существующего Калифорния остаётся ровно половина, а через 4 года он и вовсе превращается в труху из других более стабильных веществ.

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