Přístroje jaderné techniky

Oblast zaměření: Přístroje jaderné techniky
Komise : IEC/SC 45B (Radiation protection instrumentation)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 7.08.2018
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This standard applies to all kinds of passive dosimetry systems that are used for measuring

the personal dose equivalent Hp(10) (for individual whole body monitoring),

the personal dose equivalent Hp(3) (for individual eye lens monitoring),

the personal dose equivalent Hp(0,07) (for both individual whole body skin and extremity monitoring),

the ambient dose equivalent H*(10) (for workplace and environmental monitoring),

the directional dose equivalent H'(3) (for workplace and environmental monitoring), or

the directional dose equivalent H'(0,07) (for workplace and environmental monitoring).

This standard applies to dosimetry systems that measure external photon and/or beta radiation in the dose range between 0,01 mSv and 10 Sv and in the energy ranges given in Table 1. All the energy values are mean energies with respect to the prevailing dose quantity. The dosimetry systems usually use electronic devices for the data evaluation and thus are often computer controlled.

Table 1 – Mandatory and maximum energy ranges covered by this standard

Measuring quantity

Mandatory energy range for photon radiation

Maximum energy range for testing photon radiation

Mandatory energy range for beta-particle radiationa

Maximum energy range for testing beta-particle radiationa

Hp(10), H*(10)

80 keV to 1,25 MeV

12 keV to 10 MeV

Hp(3), H'(3)

30 keV to 250 keV

8 keV to 10 MeV

0,8 MeVd

0,7 MeVb to 1,2 MeVd

Hp(0,07), H'(0,07)

30 keV to 250 keV

8 keV to 10 MeV

0,8 MeVd

0,07 MeVc to 1,2 MeVd

a    The following beta radiation source are suggested for the different mean energies: For 0,06 MeV: 147Pm; for 0,8 MeV: 90Sr/90Y; for 1,2 MeV: 106Ru/106Rh.

b    For beta-particle radiation, an energy of 0,7 MeV is required to reach the radiation sensitive layers of the eye lens in a depth of about 3 mm (approximately 3 mm of ICRU tissue).

c    For beta-particle radiation, an energy of 0,07 MeV is required to penetrate the dead layer of skin of 0,07 mm (approximately 0,07 mm of ICRU tissue).

d    0,07 MeV, 0,7 MeV and 1,2 MeV beta mean energy are almost equivalent to an Emax of 0,225 MeV, 2,27 MeV and 3,54 MeV, respectively.

 

 

NOTE 1 In this standard, “dose” means dose equivalent, unless otherwise stated.

NOTE 2 For Hp(10) and H*(10) no beta radiation is considered. Reasons: 1) Hp(10) and H*(10) are a conservative estimate for the effective dose which is not a suitable quantity for beta radiation. 2) No conversion coefficients are available in ICRU 56, ICRU 57 or ISO 6980-3.

NOTE 3 The maximum energy ranges are the energy limits within which type tests according to this standard are possible.

NOTE 4 Direct ion storage (DIS) dosemeters are covered in this standard as they are often operated without an online display but a separate reader.

The test methods concerning the design (Clause 8), the instruction manual (Clause 9), the software (Clause 10), environmental influences (Clause 13), electromagnetic influences (Clause 14), mechanical influences (Clause 15), and the documentation (Clause 16) are independent of the type of radiation. Therefore, they can also be applied to other dosimetry systems, e.g. for neutrons, utilizing the corresponding type of radiation for testing.

This standard is intended to be applied to dosimetry systems that are capable of evaluating doses in the required quantity and unit (Sv) from readout signals in any quantity and unit. The only correction that may be applied to the evaluated dose (indicated value) is the one resulting from natural background radiation using extra dosemeters.

NOTE 5 The correction due to natural background can be made before or after the dose calculation.

Oblast zaměření: Přístroje jaderné techniky
Komise : IEC/SC 45B (Radiation protection instrumentation)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 14.08.2018
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This standard describes the technical requirements, test methods, inspection requirements, markings and labelling, and requirements on the accompanying documents, packaging, shipping and storage for  bottle-can liquid X-ray security inspection systems (hereinafter referred to as “the system”) based on X-ray computed tomography (CT). Here, the system is limited to those that feature tomographic scanning, not standard projection X-ray systems. This standard is applicable to liquids, aerosols and gelatinous objects in transparent or opaque containers.

This technical performance standard includes minimum performance requirements; regulators may require additional performance testing.