Date: 2018-07-04 12:05 am (UTC)
juan_gandhi: (Default)
From: [personal profile] juan_gandhi
А что это у них за нормы, 27? В советском учебнике, этак 70-х, было 5. Потом, позже, стало 10. После Чернобыля говорили, что 20 тоже ничо.

Конечно, если там на Джошуа уже чуть не 90, это как-то мне больше напоминает Питер 1986-го.

Date: 2018-07-04 12:25 am (UTC)
paserbyp: (Default)
From: [personal profile] paserbyp
Спасибо, никогда не знал, что там повышенный радиоактивный фон.

Date: 2018-07-04 12:30 am (UTC)
paserbyp: (Default)
From: [personal profile] paserbyp
You're completely right and I just found that granite is radioactive. Like many other natural materials, it contains trace amounts of uranium. Some granite bodies, however, can have 5 to 20 times the normal amount of uranium, the byproduct of which is radon gas, which has been shown to cause lung cancer. But don’t worry about significant exposure to radiation from cragging in Joshua Tree Park or upgrading your kitchen with lavish stone counters. The biggest concern lies in poorly ventilated basements that are surrounded by soils coming from granite bedrock.

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