ISO 16645:2016 pdf download

ISO 16645:2016 pdf download.Radiological protection — Medical electron accelerators — Requirements and recommendations for shielding design and evaluation
1 Scope
This International Standard is applicable to medical electron linear accelerators i.e. linear accelerators with nominal energies of the beam ranging from 4 MV to 30 MV, including particular installations such as robotic arm, helical intensity modulated radiotherapy devices and dedicated devices for intra operative radiotherapy (IORT) with electrons. The cyclotrons and the synchrotrons used for hadrontherapy are not considered. The radiation protection requirements and recommendations given in this International Standard cover the aspects relating to regulations, shielding design goals and other design criteria, role of the manufacturers, of the radiation protection officer or qualified expert and interactions between stakeholders, radiations around a linear accelerator, shielding for conventional and special devices (including shielding materials and transmission values, calculations for various treatment room configurations, duct impact on radiation protection) and the radiological monitoring (measurements).
NOTE 1 Annex A provides transmission values for the most common shielding materials.
NOTE 2 Annex B provides supporting data for shielding calculation.
NOTE 3 Annex C provides an example of calculation for conventional device and standard maze.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60976, Medical electrical equipment — Medical electron accelerators — Functional performance characteristics
IAEA Safety Reports Series Report No. 47, Radiation protection in the Design of Radiotherapy Facilities (2006)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60976 and the following apply.
4 Shielding design goals and other design criteria
4.1 Shielding design goals
Shielding design goals (P) are levels of dose equivalent (H) used in the design calculations and evaluation of barriers constructed for the protection of workers or members of the public. Different shielding design goals shall be defined for supervised, controlled and public areas. They have to be in accordance with existing national regulation or if not available according to IAEA basic safety standards on radiation protection related to effective dose limits for workers and members of the public. The P value (Sv) set by national authorities should be a fraction of dose limits for workers or for members of the public. They can be expressed as weekly values (mSv/week) since the workload (W) for a radiotherapy equipment has traditionally a weekly format. But according to national regulation, other time periods can be used. Shielding design goals (P) are practical values that are evaluated at a reference point beyond a protective barrier for the workload W proposed by the radiotherapy department.