For ionization detector, if we use gas as the sensitive medium, we can use it in two formats: sealed (left figure) and vented (right figure). In radiation clinic, we typically use the sealed ionization chamber to monitor the fluence of the x-ray beams in the linac head, while we use vented ion
chamber to check the delivered dose accuracy inside a phantom (for patient QA). Based on the
working principle of ionization chamber, discuss
a. When using the vented ion chamber, do we need to know the local atmosphere pressure and
temperature for a proper performance calibration? Why?
b. From the maintenance, measurement accuracy, etc., discuss the advantage and disadvantage of
using a sealed and vented ion chamber.

2. Discuss about the advantage and disadvantage of the cyclotron, synchrotron and linac in the aspects
of accelerator size, beam energy limitation, maintenance, beam intensity, etc.

Serious answers only please, I will flag your answer if you are just trying to gain points without trying.