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BS EN ISO 28057:2021

BS EN ISO 28057:2021

$198.66

Clinical dosimetry. Dosimetry with solid thermoluminescence detectors for photon and electron radiations in radiotherapy

Published By Publication Date Number of Pages
BSI 2021 52
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This document describes rules for the procedures, applications, and systems of thermoluminescence dosimetry (TLD) for dose measurements according to the probe method. It is particularly applicable to solid “TL detectors�, i.e. rods, chips, and microcubes, made from LiF:Mg,Ti or LiF:Mg,Cu,P in crystalline or polycrystalline form. It is not applicable to LiF powders because their use requires special procedures. The probe method encompasses the arrangement, particularly in a water phantom or in a tissue-equivalent phantom, of single TL detectors or of “TL probes�, i.e. sets of TL detectors arranged in thin-walled polymethyl methacrylate (PMMA) casings.

The purpose of these rules is to guarantee the reliability and the accuracy indispensable in clinical dosimetry when applied on or in the patient or phantom. This document applies to dosimetry in teletherapy with both photon radiation from 20 keV to 50 MeV and electron radiation from 4 MeV to 25 MeV, as well as in brachytherapy with photon-emitting radionuclides. These applications are complementary to the use of ionization chambers.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Foreword
8 Introduction
11 1 Scope
2 Normative references
3 Terms and definitions
19 4 Rules for the TLD measurement procedure
4.1 Principle of measurement
4.2 Measured quantity
20 4.3 Measurement cycle
4.3.1 General requirements
4.3.2 Sequence of measurement cycles
4.3.3 Common passing of the measurement cycles
4.3.4 Handling of TL detectors
21 4.3.5 Pre-irradiation annealing
4.3.6 Irradiation
4.3.7 Post-irradiation annealing
4.3.8 Reading
22 4.4 Measurement of the absorbed dose to water
4.4.1 Basic formula for the determination of the absorbed dose to water
4.4.2 Determination of the background value, M0
23 4.4.3 Determination of the indicated value, Mi
4.4.4 Determination of the individual calibration coefficients, Ni
25 4.4.5 Determination of the correction factors, kν
32 4.5 Uncertainty of measurement of the absorbed dose
33 4.6 Reusability
4.7 Stability check
4.8 Staff
5 Requirements for the TLD system
5.1 General information
5.1.1 Classification of the requirements
34 5.1.2 Requirements for operation characteristics
5.2 Completeness of the TLD system
5.2.1 Technical components
5.2.2 Hardware and software components
5.2.3 Operating instructions
36 5.2.4 Access to a calibration irradiation device
5.3 Requirements for TL detectors
5.3.1 Characteristics of TL materials
5.3.2 Tailoring of TL materials
37 5.3.3 Reusability of TL detectors
5.3.4 Individual variation
38 5.4 Requirements for TL-indicating instruments
5.4.1 General remarks
5.4.2 Mechanical setup
5.4.3 Warm-up time
5.4.4 Indication and indication range
5.4.5 Background value
5.4.6 Overflow indication and effects during evaluation of high doses
39 5.4.7 Test light source
5.4.8 Changes in the response
5.4.9 Mechanical construction
5.4.10 Light shielding
5.4.11 Climatic influences
5.4.12 Electrical requirements
40 5.4.13 Operational safety and detection of function failure
42 5.4.14 Data output and data backup
5.5 Requirements for auxiliary instruments (pre-irradiation annealing device)
5.5.1 Pre-irradiation annealing
5.5.2 Construction
5.5.3 Electrical requirements
5.5.4 Operation safety
43 5.5.5 Detection of function failure
5.5.6 Indication of the operating state
5.6 Requirements for the entire TLD system
5.6.1 Minimum measuring ranges
5.6.2 Minimum rated ranges of use
44 5.6.3 Ranges of test parameters
45 5.7 Requirements for the calibration irradiation device
5.8 Requirements for the accompanying papers
5.9 Acceptance tests
5.9.1 General requirements
46 5.9.2 Number of TL detectors used
5.9.3 Type of TL detectors used
47 Bibliography

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BS EN ISO 28057:2021
$198.66