ISO 3999:2004 放射線防護—産業用ガンマ線撮影用の装置—性能、設計、およびテストの仕様 | ページ 5

3.1

ambient equivalent dose rate

dose rate measured as an average over the sensitive volume of the detector

Note 1 to entry: Measurements of the ambient equivalent dose rate shall be made at 1 m from the surface and additionally at the surface of the exposure container or at 50 mm from the surface.

Note 2 to entry: The limits are given in 5.3. The maximum cross-sectional areas of the detectors to be used are given in 6.4.1.2.

cf. ICRU 51.

3.2

apparatus for industrial gamma radiography

apparatus including an exposure container, a source assembly, and as applicable, a remote control, a projection sheath, an exposure head, and accessories designed to enable radiation emitted by a sealed radioactive source to be used for industrial radiography purposes

Note 1 to entry: In the following text, an “apparatus for industrial gamma radiography” can be used for any means of non-destructive testing using gamma radiation.

3.3

automatic securing mechanism

automatically activated mechanical device designed to restrict the source assembly to the secured position

3.4

beam limiter

shielding device located at the working position designed to reduce the radiation dose rate in directions other than the directions intended for use

Note 1 to entry: The beam limiter may be designed to be used in conjunction with an exposure head or may incorporate an exposure head as an integral part of the device.

3.5

control cable

cable or other mechanical means used to project and retract the source assembly out from and into the exposure container by means of remote control

Note 1 to entry: The control cable includes the means of attachment to the source holder.

3.6

control-cable sheath

rigid or flexible tube for guiding the control cable from the remote control to the exposure container and for providing physical protection to the control cable

Note 1 to entry: The control-cable sheath includes the necessary connection(s) for attachment to the exposure container and to the remote control.

3.7

exposure container

shield, in the form of a container, designed to allow the controlled use of gamma radiation and employing a source assembly

3.8

exposure head

device which locates the sealed source included in the source assembly, in the selected working position, and prevents the source assembly from projecting out of the projection sheath

3.9

lock

mechanical device with a key used to lock or unlock the exposure container

3.10

locked position

condition of the exposure container and source assembly in the secured and locked position

3.11

maximum rating

maximum activity, expressed as in 7.1.3, of a sealed source specified for a given radionuclide by the manufacturer, marked on the exposure container and not to be exceeded if the apparatus is to conform to this International Standard

3.12

projection sheath

flexible or rigid tube for guiding the source assembly from the exposure container to the working position and having the necessary connections for attachment to the exposure container and to the exposure head, or including the exposure head itself

3.13

remote control

device enabling the source assembly to be moved to and from a working position by operation from a distance away from the exposure container

Note 1 to entry: The remote control includes the control mechanism and ここで, applicable, also the control cable, the control-cable sheath and the necessary connections and attachments.

3.14

reserve sheath

sheath containing the length of the control cable, necessary for the projection of the source assembly

3.15

sealed radioactive source

radioactive source sealed in a capsule or having a bonded cover, the capsule or cover being strong enough to prevent contact with and dispersion of the radioactive material under the conditions of use and wear for which it was designed

Note 1 to entry: In the following text, the term “sealed source” is used instead of “sealed radioactive source” for simplification.

(cf. 3.11 of ISO 2919:1999)

3.16

secured position

condition of the exposure container and source assembly, when the sealed source is fully shielded and restricted to this position within the exposure container

Note 1 to entry: In the secured position, the exposure container may be unlocked.

3.17

simulated source

source whose structure is the same as that of the sealed radioactive source but not containing any radioactive material

3.18

source assembly

source holder with a sealed source attached or included

Note 1 to entry: In cases where the sealed source is directly attached to the control cable without the use of a source holder, the source assembly is the control cable with the sealed source attached. In cases where the sealed source is not attached to the control cable nor included within the source holder, the sealed source is the source assembly. In the case where a simulated source is attached to or included with a source holder or control cable, this becomes a simulated source assembly.

3.19

source holder

holder, or attachment device, by means of which a sealed source or simulated source can be directly included in the exposure container (category I apparatus), or fitted at the end of the control cable (category II apparatus)

Note 1 to entry: Source holders may be an integral part of the source assembly or may be capable of being dismantled for sealed source replacement.

3.20

working position

condition of the exposure container and source assembly, when in the position intended for performance of industrial gamma radiography