ISO 5799:1991 PDF

Photography — Direct-exposing medical and dental radiographic film/process systems — Determination of ISO speed and ISO average gradient

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Title (English):

ISO 5799:1991

Photography — Direct-exposing medical and dental radiographic film/process systems — Determination of ISO speed and ISO average gradient

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 10
Publication date:: August 8, 1991
Edition:: ISO IS 5799 edition 2 version 1
ICS:: 37.040.25

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Description (English):

Specifies measuring methods so that the film/process system can be obtained reproducibly and can also be compared with those of other systems. Describes sensitometric procedures for films exposed directly to X-rays. This second edition cancels and replaces the first edition (1981).

Technical details

Technical committee: ISO/TC 42 - Photography
SKU: ISO 5799:1991

Abstract

Overview

ISO 5799:1991 - Photography: Direct-exposing medical and dental radiographic film/process systems - specifies standardized methods to determine ISO Speed and ISO average gradient for film/process combinations directly exposed to X‑rays. The standard ensures reproducible sensitometric measurements so film/process performance can be compared between products and suppliers. This second edition updates units (adopting the gray for air kerma) and aligns speed/gradient tables with other radiographic film standards.

Key topics and technical requirements

Scope: Sensitometric procedures for films exposed directly to X‑ray radiation in medical and dental radiography (excluding mammography).
Measurement basis: Uses air kerma (gray, Gy) as the exposure quantity and derives ISO Speed and average gradient from sensitometric curves (density vs. log10 air kerma).
Sampling & storage:
- Samples stored per manufacturer recommendations to simulate typical product age.
- Test temperature: 23 °C ± 5 °C; relative humidity 50 % ± 20 %.
Exposure & densitometry:
- Graduated exposure series providing densities from 0.2 to 2.3 above base plus fog.
- Log exposure step increments ≤ 0.15.
- Densitometer requirements per ISO 5-2 and ISO 5-3; minimum aperture 7 mm, readings ≥ 1 mm from edge.
- Base-plus-fog measured on an unexposed sample processed with test samples.
Instrumentation & calibration:
- Air kerma measured with an ionization chamber calibrated for the radiation quality used.
- Ion chamber/monitoring recommendations to reduce variability and correct for fluctuations.
Processing:
- No single processing recipe is mandated; manufacturers’ recommended processes must be reported because Speed and gradient depend on development conditions.
- Processing to begin within 30 minutes to 8 hours after exposure.
Quality controls:
- Minimize scattered radiation (scattered portion ≤ 5 % of primary).
- Film holders designed for

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and technical requirements

Scope: Sensitometric procedures for films exposed directly to X‑ray radiation in medical and dental radiography (excluding mammography).
Measurement basis: Uses air kerma (gray, Gy) as the exposure quantity and derives ISO Speed and average gradient from sensitometric curves (density vs. log10 air kerma).
Sampling & storage:
- Samples stored per manufacturer recommendations to simulate typical product age.
- Test temperature: 23 °C ± 5 °C; relative humidity 50 % ± 20 %.
Exposure & densitometry:
- Graduated exposure series providing densities from 0.2 to 2.3 above base plus fog.
- Log exposure step increments ≤ 0.15.
- Densitometer requirements per ISO 5-2 and ISO 5-3; minimum aperture 7 mm, readings ≥ 1 mm from edge.
- Base-plus-fog measured on an unexposed sample processed with test samples.
Instrumentation & calibration:
- Air kerma measured with an ionization chamber calibrated for the radiation quality used.
- Ion chamber/monitoring recommendations to reduce variability and correct for fluctuations.
Processing:
- No single processing recipe is mandated; manufacturers’ recommended processes must be reported because Speed and gradient depend on development conditions.
- Processing to begin within 30 minutes to 8 hours after exposure.
Quality controls:
- Minimize scattered radiation (scattered portion ≤ 5 % of primary).
- Film holders designed for

ISO 5799:1991 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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