Mobile Security X-ray

• Site conducted

  Select

• Conducted on

  Date

• Prepared by

• Location
  Address

• Make and model of X-ray equipment

Labelling

• Does the X-ray unit have appropriate warning labels

  Yes

  No

  N/A

• The X-ray equipment carries warning similar to:
  Warning this X-ray equipment may be hazardous unless safe exposure factors and operating instructions are observed
  
  Caution x-rays produced when energized
  
  Caution equipment produces radiation

• Is the tube potential and current fixed

  Yes

  No

  N/A

• How are is the potential and current controlled

• Where the X-ray tube potential and current are fixed, their values must be indicated by permanent labelling on the x-ray unit or in accompanying documents

Exposure Factors

• Can the exposure factors be chosen without energizing the tube

  Yes

  No

  N/A

• X-ray equipment must be designed to permit the operator to preset exposure factors without the need for energizing the X-ray tube

Supply Indicator

• Is their a clear and unambiguous on off indicator on the control panel

  Yes

  No

  N/A

• An indicator on the control panel must be incorporated to indicate when the main switch is in the “ON” position and the control panel is energized.

Beam on Indicator and Audible Indicator

• Is there an indicator, clearly visible to the operator, which indicates when the X-ray tube is energized.<br>

  Yes

  No

  N/A

• A signal audible to the operator, must indicate either the duration of the exposure or its termination. Note, in some types of mobile security x-ray equipment the noise of the “spark gap” operating is considered by the manufacturer to be sufficient for this criteria to be met

Security of exposure control

• Is the exposure switch secure from unauthroised operation

  Yes

  No

  N/A

• A key switch must be fitted to the X-ray control panel to prevent unauthorized use. The key must be removable only when the switch is in the off position. The function of the key switch and its on and off positions must be clearly marked on the control panel.
  RHS 31 5.2.1.3
  X-ray on and off controls must be physically separate from the key switch. Their function, and the on and off positions, must be clearly marked on the control panel.
  RHS 31 5.2.1.4

Initiation of Exposure

• Does the unit comply with the provision for delayed initiation of exposure

  Yes

  No

  N/A

• A delayed exposure setting must provide an audible/visible indication that the x-ray unit is preparing to expose

Remote Control of Exposure

• Can the remote control interrupt exposure at any time

  Yes

  No

  N/A

• Where the x-ray exposure is initiated by a remote control connected to the x-ray unit, the exposure must be able to be interrupted at any time (dead man operation of the switch).
  Where the x-ray exposure is initiated by a remote control connected to the x-ray unit continuous pressure on the exposure switch must be required in order for an exposure to occur.

Exposure Timer

• Is the exposure controlled by an appropriate electronic timer

  Yes

  No

  N/A

• The exposure timer must be electronic and the circuit of the apparatus must be so designed that in the event of any failure, the
  failure causes the timer to revert to a safe condition and does not lead to the X-ray tube becoming energized or continuing to be
  energized. Compliance may be demonstrated by evidence contained in accompanying documents. A device must be provided which must terminate the production of X-rays after a preset interval not exceeding 30 minutes.
  RHS 31 5.2.1.5
  
  The timer must terminate an exposure at a preset time interval, preset number of pulses or a preset product of current and time.
  a) This must be achieved by selecting the required time or number of pulses on the device or by selecting an icon. The manufacturer/supplier must clearly document the exposure time for each icon or state an estimate of the exposure time in terms of the number of pulses. Note the pulse repetition rate for “spark gap” operated equipment may vary and affect the exposure time. The manufacturer must make note of this in accompanying document.
  b) It must not be possible to make exposures when the exposure device is set to “0” or “off” or an equivalent position;
  c) It must be possible to alter the timer or pulse settings to a higher or lower value after the initial adjustment without initiating exposure;

Output Kerma

• The variation in radiation output must not exceed more than 15% from the mean of eight exposures taken within 10 minutes

  Yes

  No

  N/A

Linearity of Output

• The coefficient of linearity of the radiation output must be less than or equal to 0.15 when measured at three different time (number of <br>pulses) settings.

  Yes

  No

  N/A

Tube Voltage Accuracy

• The delivered X-ray tube voltage (kV peak) average should be within +/-5 kV or +/- 5%, whichever is the greater, of the nominal <br>or indicated value. <br>Note this is not a mandatory compliance requirement but may be measured to indicate long term performance of the x-ray unit. <br>The following points need to be taken into account when specifying the criteria for kV accuracy for pulsed equipment.<br>a) The output voltage for pulsed equipment can vary depending on the spark gap firing voltage.<br>b)The output voltage also depends on the impedance of the x-ray tube

  Yes

  No

  N/A

Limitation of Primary Radiation

• Each X-ray tube must be mounted in a protective housing or other protective shielding. The X-ray window of such housing must have an aperture of such dimension that it will not allow passage of a useful beam larger than the maximum specified.

  Yes

  No

  N/A

• Leakage radiation from the x-ray unit (with the primary beam appropriately attenuated so as to not contribute to the measurement) must not exceed 30 uSv/h at 1 m from any point on the x-ray unit’s surface. X-ray duty cycle may be taken into account when calculating the leakage rate.

  Yes

  No

  N/A