To ensure that shielding calculations and recommendations are adequate and, that the radiation dose to the public and occupational staff is below regulatory limits, the proposed floor and shielding plans shall be submitted to Health Physics for review and approval as early in the design process as possible to reduce the possible necessity of late in the project required design changes. (See the below section on the state approval timeline for new therapy machines.)

During construction and/or renovations, a shielding evaluation review shall be performed by Health Physics for the area included in the shielding calculation report.

Note: Any changes in machine x-ray tubes must (California Code Title 17, section 30115) must be report in writing within 30 days. This includes any change in: registrant’s name, address, location of the installation or receipt, sale, transfer, disposal or discontinuance of use of any reportable source of radiation.

Survey for New Machine Installation

Unless otherwise specified, Health Physics must survey the installation of radiation-producing machine(s), whether newly acquired, relocated, modified, or repaired to determine the effectiveness of health and safety hazard controls. Contact Health Physics at (650) 723-3201.

Warning Signs

All devices and equipment capable of producing radiation when operated shall be appropriately labeled to caution individuals that such devices or equipment produce radiation. Rooms or areas that contain permanently installed x-ray machines as the only source of radiation shall be posted with a sign or signs that bear the words, “CAUTION X-RAY.”

Operation Signals

Any radiation-producing machine that is located in an area accessible to occupational workers and is capable of producing a dose equivalent of 0.1 rem (1 mSv) in 1 hour at 30 centimeters from the radiation source, shall be provided with conspicuous visible or audible alarm signal so that any individual near or approaching the tube head or radiation port is aware that the machine is producing radiation.