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ISO/ASTM51275-04
Standard Practice for Use of a Radiochromic Film Dosimetry System
5 стр.
Действует
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Сборник (ASTM):
12.02 Nuclear (II), Solar, and Geothermal Energy; Radiation Processing / Ядерная энергия (II), Солнечная, и Геотермическая Энергия; Радиационная обработка
Тематика:
Nuclear Technology
Описание
Значение и использование

4.1 The radiochromic film dosimetry system provides a means of determining absorbed dose in materials. Under the influence of ionizing radiation, chemical reactions take place in the radiochromic film creating or enhancing, or both, optical absorption bands. Absorbance is determined within these radiation-induced absorption bands using a spectrophotometer or photometer (See 5.1.2).

4.2 In the application of a specific dosimetry system, absorbed dose is determined by use of a calibration curve traceable to national or international standards.

4.3 The absorbed dose determined is usually specified in water. Absorbed dose in other materials may be determined by applying conversion factors. This is discussed in ISO/ASTM Guide 51261.

NOTE 1 - For comprehensive discussion of various dosimetry methods applicable to the radiation types and energies discussed in this practice, see ICRU Reports 14, 17, 34, and 35.

Область применения

1.1 This practice covers the procedures for handling, testing,and using a radiochromic film dosimetry system to measure absorbeddose in materials irradiated by photons or electrons in terms ofabsorbed dose in water.

1.2 This practice applies to radiochromic film dosimeters thatcan be used within part or all of the specified ranges asfollows:

1.2.1 The absorbed dose range is 1 Gy to 100 kGy.

1.2.2 The absorbed dose rate is 1 x 10-2 to 1 x1013 Gy/s (1-4).

1.2.3 The radiation energy range for both photons and electronsis 0.1 to 50 MeV.

1.2.4 The irradiation temperature range is -78 to +60°C.

1.3 This practice applies to radiochromic films of variousformats, including small pieces used to measure a single dosevalue, strips used for one-dimensional dose-mapping, and sheetsused for two-dimensional dose-mapping. Three-dimensionaldose-mapping may be achieved by proper placement of any of theseformats.

1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.

Ключевые слова:
absorbed dose; dose measurement; dosimeter; dosimetry; electron beam; gamma radiation; ionizing radiation; quality control; radiation processing; radiochromic dosimetry; radiochromic film;