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ASTM/ISO 51026-15
Standard Practice for Using the Fricke Dosimetry System
Automaticky preložený názov:
Štandardné praktiky pre použitie Fricke dozimetrické systém
NORMA vydaná dňa 9.2.2015
Informácie o norme:
Označenie normy: ASTM/ISO 51026-15
Poznámka: NEPLATNÁ
Dátum vydania normy: 9.2.2015
Kód tovaru: NS-590607
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM/ISO 51026-15 :
Keywords:
absorbed dose, dosimetry, ferrous ammonium sulfate dosimeter, ferrous sulfate dosimeter, Fricke dosimeter, reference-standard dosimetry system,, ICS Number Code 17.240 (Radiation measurements)
Doplňujúce informácie
| Significance and Use |
|
4.1 The Fricke dosimetry system provides a reliable means for measurement of absorbed dose to water, based on a process of oxidation of ferrous ions to ferric ions in acidic aqueous solution by ionizing radiation (ICRU 80, PIRS-0815,4.2 The dosimeter is an air-saturated solution of ferrous sulfate or ferrous ammonium sulfate that indicates absorbed dose by an increase in optical absorbance at a specified wavelength. A temperature-controlled calibrated spectrophotometer is used to measure the absorbance. |
| 1. Scope |
|
1.1 This practice covers the procedures for preparation, testing and using the acidic aqueous ferrous ammonium sulfate solution dosimetry system to measure absorbed dose to water when exposed to ionizing radiation. The system consists of a dosimeter and appropriate analytical instrumentation. The system will be referred to as the Fricke dosimetry system. The Fricke dosimetry system may be used as either a reference standard dosimetry system or a routine dosimetry system. 1.2 This practice is one of a set of standards that provides recommendations for properly implementing dosimetry in radiation processing, and describes a means of achieving compliance with the requirements of ISO/ASTM Practice 52628 for the Fricke dosimetry system. It is intended to be read in conjunction with ISO/ASTM Practice 52628. 1.3 The practice describes the spectrophotometric analysis procedures for the Fricke dosimetry system. 1.4 This practice applies only to gamma radiation, X-radiation (bremsstrahlung), and high-energy electrons. 1.5 This practice applies provided the following are satisfied: 1.5.1 The absorbed dose range shall be from 20 to 400 Gy 1.5.2 The absorbed-dose rate does not exceed 106 Gy·s−1 (2). 1.5.3 For radioisotope gamma sources, the initial photon energy is greater than 0.6 MeV. For X-radiation (bremsstrahlung), the initial energy of the electrons used to produce the photons is equal to or greater than 2 MeV. For electron beams, the initial electron energy is greater than 8 MeV. Note 1: The lower energy limits given are appropriate for a
cylindrical dosimeter ampoule of 12 mm diameter. Corrections for
displacement effects and dose gradient across the ampoule may be
required for electron beams 1.5.4 The irradiation temperature of the
dosimeter should be within the range of 10 to 60°C.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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