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Консультация № 178725
29.05.2010, 13:16
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Здравствуйте Уважаемые эксперты. Помогите пожалуйста решить задачу.
В кровь больного человека (её объём составляет 6 литров) ввели 2 кубических сантиметра физиологического раствора радиоизотопа натрия (Т=15 часов). Через двое суток была взята проба крови объёмом 1 кубический сантиметр. Её активность (число распадов ядер в единицу времени) оказалось равной 0,01 расп/мин. Какова была активность раствора введённого в организм больного?
В кровь больного человека (её объём составляет 6 литров) ввели 2 кубических сантиметра физиологического раствора радиоизотопа натрия (Т=15 часов). Через двое суток была взята проба крови объёмом 1 кубический сантиметр. Её активность (число распадов ядер в единицу времени) оказалось равной 0,01 расп/мин. Какова была активность раствора введённого в организм больного?
Обсуждение
01.06.2010, 21:39
общий
это ответ
Здравствуйте, STASSY.
Думаю, что так
Дано:
V=6 л = 6*10-3 м3
v0=2 cм3 = 2*10-6 м3
Т=15 часов = 900 мин
t=2 сут = 2880 мин
v=1см3=10-6 м3
А'=0.01 мин-1
Найти: А0
Решение:
Активность всего объема крови с физраствором равна активности растворенного физраствора и она во столько же раз больше активности 1 см3 крови с физраствором, во сколько раз общий объем крови больше чем объем, взятый для анализа, т.е.
А=А'*(V/v)=0.01*6000=60 мин-1
Тогда, согласно закону радиоактивного распада,
A=A0*2-(t/T)
Тогда
А0=А*2(t/T)=60*22880/900=551 мин-1
Удачи
Думаю, что так
Дано:
V=6 л = 6*10-3 м3
v0=2 cм3 = 2*10-6 м3
Т=15 часов = 900 мин
t=2 сут = 2880 мин
v=1см3=10-6 м3
А'=0.01 мин-1
Найти: А0
Решение:
Активность всего объема крови с физраствором равна активности растворенного физраствора и она во столько же раз больше активности 1 см3 крови с физраствором, во сколько раз общий объем крови больше чем объем, взятый для анализа, т.е.
А=А'*(V/v)=0.01*6000=60 мин-1
Тогда, согласно закону радиоактивного распада,
A=A0*2-(t/T)
Тогда
А0=А*2(t/T)=60*22880/900=551 мин-1
Удачи
Об авторе:
С уважением
shvetski
С уважением
shvetski
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