MSG: Personal Safety Instruction Checklist

Personal Safety Checklist for X-ray Diffraction

Last revised 10/12/05. This file can be accessed at http://msg.ucsf.edu
All Authorized Users are required to agree to these policies in writing prior to entering the restricted area. For details, see Chris Waddling.

General information:

Report any equipment failure or safety concerns to Chris Waddling by e-mail. Office: S126C, 476-8288 (wk); 810-7556 (cell); .
Campus-wide emergency number: 476-6911
In case of suspected or actual exposure to the direct x-ray beam, see your health service or the emergency room. Any incident should also be reported to the Radiation Safety Officer at 476-1300.
All users are required to have a G1 dosimetry film badge from Environmental Health and Safety (EH&S). See your laboratory manager for information.
Each detector has a "User Log" notebook; each user must record an entry at the beginning of each run.

Safe Practices:

Telltale Lights Users should check the Power and Shutter lights every time they walk into the room. Each light operates in an interlock circuit such that if the light is off, you are guaranteed that either the Power is off, or the Shutter is closed.

Beamstops Beamstops serve two functions: to shorten the path of air scatter, and to protect the image plate. Users should check that the beamstop is in place whenever x-ray power is on, regardless of the shutter status. If you wish to remove the beamstop to check the direct beam position, you must remain in the room while you are doing the experiment.

Protecting Your Fingers from the Direct Beam When you manipulate anything in the vicinity of the goniometer, you should assume that the shutter is open and that there is no beamstop: therefore do not put your fingers in the path of the direct beam.

Generator Room Access Generator rooms are not shielded from air scatter.

Beam-confinement Labyrinths Labyrinths are junctions between two pieces of equipment through which the beam passes. Any small disturbance of the x-ray optics can ruin the alignment, and reduce the beam intensity. In this event, call Chris Waddling for assistance. Furthermore, if the equipment is severely distorted, dangerous amounts of x-rays can leak out. Visually check that the beam path is properly intact before opening the shutter.

Survey Meters Users should know how to conduct radiation survey with portable meter.

X-ray Shutter When data are not being collected the shutter switch should be closed. Before opening the shutter, double check that the beamstop and shields are in place, and that the labyrinths are properly aligned.

Visitors Visitors must be escorted by an authorized user. It is considered to be a risk factor to bring visitors into the generator rooms.

Information specific to each x-ray detector:

Detector Raxis IV Raxis IV

Room S178
S174

Room Access Access by key or proximity card through S127/S176

Generator RU-200 [AFC5] RU-200 ["Charybdis"]

Normal operating power 50 kV x 90 mA 50 kV x 90 mA

How to check the status of x-ray power Red "X-ray Power" lamp on tabletop XG Controller "x-ray" red light Voltage and Current gauges

Installation Port Right Right

Number of independent shutters 1 1

Operation of shutter control switch up = open (used only for direct beam shots)
middle = closed

down = external software control (normal data collection mode)

How to check the shutter status 2 Shutter lamps Red/Green LEDs on switch panel

Beam-containment Labyrinths Interface between Osmics and collimator Interface between mirror box and collimator

Web page maintained by Chris Waddling. Last modified: 10/12/05

Telltale Lights	Users should check the Power and Shutter lights every time they walk into the room. Each light operates in an interlock circuit such that if the light is off, you are guaranteed that either the Power is off, or the Shutter is closed.
Beamstops	Beamstops serve two functions: to shorten the path of air scatter, and to protect the image plate. Users should check that the beamstop is in place whenever x-ray power is on, regardless of the shutter status. If you wish to remove the beamstop to check the direct beam position, you must remain in the room while you are doing the experiment.
Protecting Your Fingers from the Direct Beam	When you manipulate anything in the vicinity of the goniometer, you should assume that the shutter is open and that there is no beamstop: therefore do not put your fingers in the path of the direct beam.
Generator Room Access	Generator rooms are not shielded from air scatter.
Beam-confinement Labyrinths	Labyrinths are junctions between two pieces of equipment through which the beam passes. Any small disturbance of the x-ray optics can ruin the alignment, and reduce the beam intensity. In this event, call Chris Waddling for assistance. Furthermore, if the equipment is severely distorted, dangerous amounts of x-rays can leak out. Visually check that the beam path is properly intact before opening the shutter.
Survey Meters	Users should know how to conduct radiation survey with portable meter.
X-ray Shutter	When data are not being collected the shutter switch should be closed. Before opening the shutter, double check that the beamstop and shields are in place, and that the labyrinths are properly aligned.
Visitors	Visitors must be escorted by an authorized user. It is considered to be a risk factor to bring visitors into the generator rooms.

Detector	Raxis IV	Raxis IV
Room	S178	S174
Room Access	Access by key or proximity card through S127/S176
Generator	RU-200 [AFC5]	RU-200 ["Charybdis"]
Normal operating power	50 kV x 90 mA	50 kV x 90 mA
How to check the status of x-ray power	Red "X-ray Power" lamp on tabletop XG Controller "x-ray" red light Voltage and Current gauges
Installation Port	Right	Right
Number of independent shutters	1	1
Operation of shutter control switch	up = open (used only for direct beam shots) middle = closed down = external software control (normal data collection mode)
How to check the shutter status	2 Shutter lamps Red/Green LEDs on switch panel
Beam-containment Labyrinths	Interface between Osmics and collimator	Interface between mirror box and collimator