Question

Study the following statements.
$1.$ Iodine - $131$ is used in imaging the brain.
$2.$ ${}_{11}^{23}Na$ charges to ${}_{12}^{24}Mg$ by bombardment of ${}_0^{1}n$ and successive emission of $\beta -particle$.
$3.$ ${}^{40}K$ is used to determine age of objects up to $1$ million years old.
$4.$ 'Little boy' relates to U-bomb.
Which of the above is/are false?

• A. Only $1$
• B. $2$ and $3$
• C. $3$ and $4$
• D. All of these

Answer 1

The correct option is A Only $1$

Iodine - 131 is used in imaging the brain. is false.

Radioactive iodine (I-131), an isotope of iodine that emits radiation, is used for medical purposes. When a small dose of I-131 is swallowed, it is absorbed into the bloodstream in the gastrointestinal (GI) tract and concentrated from the blood by the thyroid gland, where it begins destroying the gland's cells.

The most widely used iodine radioisotope, iodine-131, emits radiation in the form of medium energy gamma rays and beta particles, which disrupts molecules in cells and deposits energy in tissues, causing damage.