On most linear accelerators, the isocenter distance is at ___; and on a cobalt-60 machine, the distance is at ___.

The radiation beam has an intensity of 100 mR/hr at a distance of 20 cm from the source.  What is the intensity at 36 cm from the source?

Which of the following best describes the Mayneord factor?

Convert 2 Gy into rad.

The value of TMR is never greater than:

Orthovoltage x-ray machines have energies in the range of which of the following?

What is the Mayneord Factor for a patient who was originally treated at 100 cm SSD to a depth of 5 cm with a 10MV photon beam, but now needs to be treated at 110 SSD?

USE HANDOUT TABLES FOR THE FOLLOWING CALCULATIONA patient is treated on a 6 MV linac treatment machine at 100 cm SSD to his left hip.  The patient is supine and is being treated through a single field.  The collimator setting is 17 x 12 cm.  Some blocking is used to shape the field and the EFS is determined to be 12 x 12 cm.  The blocks are mounted on a slotted lucite tray which is       5 mm in thickness.  The prescription states that a dose of 3000 cGy is to be delivered to a depth of 5 cm in 10 fractions.  Calculate the MUs per fraction.Calculate the treatment time.

When multiple MV photon beams are used, the dose at Dmax  is normally

Why is a favorable therapeutic ratio desirable in radiation therapy?