radioisotopes often emit alpha particles, beta particles, or gamma rays. the distance they travel through matter increases in order from alpha to gamma. each radioisotope has a characteristic half-life, which is the time needed for half of a sample of radioisotope to undergo nuclear decay.

which quality is desirable for a radioisotope that is used for medical imaging of a specific organ? check all that apply.

1) Enough long-lived to reach the organ to be studied by imaging

2) gamma radiation preferably so it can reach the imaging apparatus.

Explanation:

The radioisotope should have and adequately long half-life to travel to the organ and still be emitting in its form of decay.

The other important characteristic is that the isotope should be emitting gamma rays which are not stopped by the tissues that the radiation has to travel through in order to reach the imaging detection instrument. Alpha particles are easily stopped by organ tissue, and beta particles although they are more penetrating than alpha particles and cause less ionization damage, are also easily stopped by even the clothes the person wears.

B. half-life of several days

D. emission of gamma rays

F. ability to be attached to a compound used by the body

Explanation:

Just took the edge review

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.