Kako to mislite banane su radioaktivne a ako je konzumiras nisi ozracen? Odakle potice ta radijacija?
Organizam odrzava nivo kalijuma. Ako uneses dodatne kolicine, visak biva ekspresno izbacen iz organizma, tako da je neto kolicina kalijuma uvek na istom nivou (u totalu, prosecni covek sadrzi oko 160g kalijuma, i od te kolicine tek je 0.0117 % radioaktivno (izotop K-40). Procentualno, banana tipicno nije nista vise radioaktivna nego sto je to vec samo ljudsko telo.Kako to mislite banane su radioaktivne a ako je konzumiras nisi ozracen?
Najpre -- sve je u redu sa bananama, prirodna radijacija nalazi se svuda oko nas, u svoj hrani koju jedemo i u nama; nema je više u bananama nego u drugoj hrani. Svako zna šta je banana ili Big Mac; možda se Apple-u ne bi dopalo da se recimo jabuka koristila kao indeks 1995. godine.
"Banana Equivalent Dose" koristi se da bi "običan svet" mogao bolje da razume i upoređuje radijaciju, umesto da sluša o "miliremima", "pikokirijima" ili "mikrosivertima".
Međutim, kao što je Vgagi već rekao, nuklearni lobi koristi bananu koja može da da lažni osećaj sigurnosti. "Sve oko nas zrači, evo čak i banana koju jedemo..." -- slušalac će dobiti utisak svi radioaktivni izotopi isti, tj. da nema razlike između radijacije koju emituje jedna banana (98,2 nSv) i malecni izotop joda. Ne razmišljamo o vremenu poluraspada i o tome da kalijum iz banana ne ostaje u telu, dok drugi vidovi jonizujućeg zračenja ostaju, kumulativno u organima i putuju kroz krvotok.
HEROES: Inside story of the Fukushima 50
FUKUSHIMA 50 (more than 1,000 actually): "We expect to die,""There is nobody but us to do this job, and we cannot go home until we finish the work."
Here are extracts from three different sources: personal interviews with a Fukushima nuclear plant worker, an interview with the mother of a worker (they're anonymous so we don't know if it is the same worker) and a description of the living conditions for the pool of workers as they take turns going into the plant.
1. From interview with a worker's mother in Fukushima 50: We expect to die
on FoxNews via matzav.com
Speaking tearfully through an interpreter by phone, the mother of a 32-year-old worker said: “My son and his colleagues have discussed it at length and they have committed themselves to die if necessary to save the nation. . . He told me they have accepted they will all probably die from radiation sickness in the short term or cancer in the long-term.”
The woman spoke to Fox News on the condition of anonymity because, she said, plant workers had been asked by management not to communicate with the media or share details with family members in order to minimize public panic.
She could not confirm if her son or other workers were already suffering from radiation sickness. But she added: “They have concluded between themselves that it is inevitable some of them may die within weeks or months. They know it is impossible for them not to have been exposed to lethal doses of radiation.”
2. From Interview with Fukushima worker
on Yahoo.com
One worker told national Mainichi newspaper said when he was called in mid-March to help restore power at the plant, he did not tell his family because he did not want them to worry. But he did tell a friend to notify his parents if he did not return in two weeks.
"I feel very strongly that there is nobody but us to do this job, and we cannot go home until we finish the work," he said.
Early on, the company ran out of full radiation suits, forcing workers to create improvised versions of items such as nylon booties they were supposed to pull over their shoes.
"But we only put something like plastic garbage bags you can buy at a convenience store and sealed them with masking tape," he said.
He said the tsunami littered the area around the plant with dead fish and sharks, and the quake opened holes in the ground that tripped up some workers who could not see through large gas masks. They had to yell at one another to be heard through the masks.
"It's hard to move while wearing a gas mask," he said. "While working, the gas mask came off several times. Maybe I must have inhaled much radiation."
3. From Fukushima famine by Jamie Dean
on worldmag.com
. . . [C]onditions are grueling for the hundreds of workers [later article at yahoo.org cited "more than 1,000 engineers working around the clock since the incident began"] battling radiation leaks and contaminated water at the badly damaged [Fukushima nuclear] plant . .. As many as 580 workers at a time pack the halls and offices of a two-story, earthquake-resistant building serving as emergency headquarters at the nuclear power plant. (The building stands about a half mile from Reactor No. 1.) The workers pull three-day shifts, returning after one day off-site.. .
Breakfast is a package or two of cookies and a small carton of vegetable juice. Dinner is usually rice with vegetables and a can of meat. No lunch. Fresh water is also scarce: Since workers are limited to 1.5 liters of water a day. . . they wash their hands with alcohol and usually don't bathe. . .
Christian relief group CRASH (Christian Relief, Assistance, Support and Hope) sent an assessment team to Fukushima to assess relief needs. CRASH worker Scott Eaton formerly worked as a teacher in the region, and was a member of Fukushima Daiichi Seisho Baptist Church. He reported that seven of the church's members work at the power plant. (JR: It is my understanding that Team Leader Naoyoshi Sato is one of these 7 members.)
Eaton also reported that a church in an area beyond the evacuation zone had offered to host all of the displaced members of the Fukushima church. And a Christian campground in Okutama had invited all the church members to move into the group's facilities. Eaton said he was relieved to see Japanese churches offering support: "This is the body of Christ.
Sve ove cifre su, manje vise, tacne. Ono sto nedostaje je objasnjenje na sta se one odnose.^ Podatak za ispuštenu radijaciju za Fukušimu je čudesno tačan, dok za Černobilj u literaturi stoji: od 12.000.000 do 14.000.000 TBq (32 do 48 puta više nego do sada u Fukušimi). U gornjoj tabeli je 5.200.000 TBq.
Da dodam, ovo su brojke NISA-e, japanska nuklearna agencija (JAIF) “pretpostavlja” da je Fukušima do sada izračila 670.000 TBq (što je skoro duplo više od pretpostavke NISA-e).
The head of the Atomic Energy Society of Japan, Takashi Sawada, said yesterday that fuel rods in reactors 1 and 3 have melted and settled at the bottom of their containment vessels, confirming fears that the plant suffered a partial meltdown after last month’s huge earthquake and tsunami.
Learning from the past, Tokyo Electric Power Co. will move emergency generators to higher ground to avoid further tsunamis as the company, and nation, continues its crusade to stabilize the crippled Fukushima reactors.
..Engineers at the utility rejected a proposal to flood the reactors, which could lower temperatures in days rather than months. Instead, the utility is pumping in water and venting off steam, a method called “feed and bleed.”
Flooding would increase the amount of tainted water that gets into the ocean and also raise the possibility of more hydrogen explosions inside the containment vessels, officials at the scene said.
Ne preteruj. Cak i tamo gde je vazduh najprljaviji dovoljno je prati PV na svake 2-3 nedelje. Pustinjski solarni PV se relativno retko zaista peru, mozda 2-3 puta godisnje; ono sto se radi kod njih je ciscenje od prasine komprimovanim vazduhom. A masovna upotreba PV-a bi svakako dovela do cistijeg vazduha......koliko kosta da se svakodnevno cisti ogromna povrisna solarnih panela (ako su zaprljani menje su efikasni)
Sistemi trece generacije (kombo thermal + PV, sa rezervoarima za skupljanje termo energije i stirling generatorima za pretvaranje toplotne energije u elektricnu), postavljeni iskljucivo po krovovima kuca i zgrada, sposobni su da zadovolje 90% rezidencijalnih energetskih potreba na geografskoj sirini Kanade preko celog dana i tokom cele godine.gde smestiti sve te solarne panele i sta raditi sa njima kad padne mrak ili bude oblacno vreme...
Problem: promenljiva proizvodnja
„Novi izvori energije“ ne mogu da budu ozbiljna alternativa hidro, termo i nuklernim elektranama zbog svoje promenljive proizvodnje u toku dana koja ne može da prati poptrebe potrošača. Zato, u periodima kada ovi izvori ne mogu da proizvode energiju, njihovu proizvodnju moraju da preuzimaju klasične elektrane kojima ne odgovara ova česta promena angažmana. Iz tog razloga se u zemljama koje imaju velike instalisane snage novih izvora ne dozvoljava da ova snaga bude veća od 20% ukupne instalisane snage izvora elektroenergetskog sistema.
Jednostavna računica za solarnu energiju
Dozračena energija od sunca u idelanim slučajevima (nema oblaka ili prašine i zraci upadaju upravno na fotoelektrične ćelije) iznosi oko 1.000 W po kvadratnom metru. Pošto su ćelije u stanju da u električnu energiju pretvore najviše 10% dozračene energije (imaju stepen iskorišćenja 0,1), po jednom kvadratnom metru iz ćelije se u idealnim uslovima može dobiti 0,1 x 1000 = 100 W. Prema tome, da bi se dobila snaga od 100 MW potrebno je fotoelektričnim ćelijama pokriti površinu od 100 hektara (1.000.000 kvadratnih metara).
Ako se uzmu u obzir gubici u ostalim delovima elektrane, da bi se dobila navedena snaga površina pokrivena ćelijama trebalo bi da bude bar za reda 30% veća od porethodno izračunate. Inače, fotoelektrične ćelije treba neprekidno održavati i čistiti ih jer im se inače stepen iskorišćenja još više smanjuje.
Može se koristiti i fototermički efekat koji ima veći stepen iskorišćenja dozračene energije sunca ali je on vrlo skup. On zahteva da ogledala koja usmeravaju sunčeve zrake u žižu, gde se nalazi kotao u kome se zagreva radni fluid za pokretanje turbina, neprekidno prate kretanje sunca u toku dana kako se ne bi promašila žiža.
Sve ovo vrlo mnogo košta a punom snagom može da radi samo u pojedinim periodima godine i dana pod uslovom da je automatizovano i da se redovno i stručno održava. Prema tome, mrka kapa.
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