1. Have contraindication to MR imaging (i.e. ferrous implants, cardiac pacemakers) - determined by MR screening prior to scans.

2. Have a history of claustrophobia.

3. Female exclusion only: are or may be pregnant, or are planning to become pregnant.

4. Requires an oxygen mask and cannot use a nasal cannula.

5. Blood oxygen saturation is below 92% (measured at rest in a sitting position, and with an O2 nasal cannula if the participant normally uses one).

6. Has had an acute respiratory infection in the past 10 days.

7. Is a student currently enrolled in a course at Lakehead University where the Principal Investigator (PI) is the instructor.

8. Is a student currently enrolled in a degree program at Lakehead University where the PI is their direct thesis supervisor.

9. Is currently an employee of the PI at the Thunder Bay Regional Health Research Institute (TBRHRI) and/or Lakehead University.

1\. Must be a non-smoker (self-identified)

Hyperpolarized Noble Gas MRI Detection of Radiation-Induced Lung Injury