The physical half life of radioactive 131I is:
A. 8 hours
B. 8 days
C. 16 days
D. 60 day
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1 Answer

Answer :

. 8 days
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Description : Ceftriaxone has all the following attributes except: A. It has a long plasma half life of 8 hours B. It can cause bleeding by prolonging prothrombin time C. It has attained high cure rates in multiresistant typhoid infection D. It penetrates CSF poorly and therefore not effective in meningitis

Answer : D. It penetrates CSF poorly and therefore not effective in meningitis

Description : A radioactive isotope has a half-life of 10 days. If today there are 125 g of it left, what was its original weight 40 days earlier  (a) 600 g (b) 1000 g (c) 1250 g (d) 2000 g 

Answer : Half life = 10days  The formula which is, 1/(2)^n × original weight = Weight left today.  To obtain the value of n = divide no of days by half life ie.,n= 40/10= 4 n=4 So, 1/(2)^n × original Weight = 125g 1/(2)^4 × Original weight = 125 Original weight = 16×125 = 2000g

Description : A 60-year-old male presents with severe hyperthyroidism and multinodular goiter. It was decided to treat him with 131I. The most appropriate course of treatment would be: A. Immediate 131I dosing with no ... . Propranolol + Lugol's iodine for 2 weeks- 131I-continue Lugol's iodine for 2-3 months

Answer : C. Propranolol + carbimazole till severe thyrotoxicosis is controlled—1 week gap—131I— resume carbimazole after 1 week for 2-3 month

Description : A 65-year-old man was brought to the hospital with complaints of pain in lower abdomen and not having passed urine for 16 hours. The bladder was found to be full. His son informed that he ... drugs is he most likely to have received: A. Alprazolam B. Sertraline C. Amitryptyline D. Trazodone

Answer : C. Amitryptyline

Description : Oxadiazon has a half life of 60 days, so after 120 days the concentration will be a). ½ b). ¼ c). 1/3 d). 1/5

Answer : b). ¼