rad safety quiz Flashcards
background radiation rate
0.2 uSv/h
linac head component activation
0.8 mGy/h after 30 min of continuous beam on
why don’t we worry about neutron production for head leakage on secondary barriers for high E beam?
very low dose rate (0.1% of iso dose rate)
electron current compared to photo
3 orders of magnitude lower for electrons than photons
photodisintegration for electron vs photon mode
2 orders of magnitude less for electron mode
types of barriers for gamma knife shielding
has inherent shielding so everything is secondary barrier
what is in annual CNSC compliance report
workloads
service
not leak test (record this but don’t report)
requirements for person coming to service HDR
communication between 2 licensees
evacuation plan
procedures to bypass safety system
how to contact RSO
can certified RSO be auto ceritifed for another center?
no, because devices are different
length of CNSC inspections
type 1 - 3-5 days
type 2 - 1 day
how to build ducts
-never put duct in primary barrier
-install duct at an angle (not straight through wall)
HDR activity
Ir-192 is 10 Ci at install, 3-5 Ci when shipped back
What does RSO look after?
training and authorization
radiation dose monitoring
inventory
safety management system
reporting
licensing
compliance
radiation safety committee
meets as often as indicated in license
license defines who is there and how often
typicallyy meet up quarterly
-discuss changes of licenses, incidences, day to day operation
-written minutes are mandatory
dose from airport scanner
-skin dose: 40 nGy
11 nSv effective dose (equivalent to 12 s of flight)
