BS EN 421:2010 pdf download

BS EN 421:2010 pdf download.Protective gloves again stionizing radiation and radioactive contamination.
4.7.2 Design for gloves for containment enclosures
4.7.2.1 General
The glove shall comply with the relevant requirements defined in ISO 11933-2.
When the metallic element distribution is not uniform over the glove, the manufacturer shall mark the
equipment and provide the information accordingly (see Clauses 6 and 7).
4.7.2.2 Glove sizing and dimensions
In the case of gloves to be mounted in containment enclosures, prescriptions of ISO 11933-1 and ISO 11933-2 shall be followed.
Gloves used in containment enclosures are often used with under gloves. The user will have to take into account this parameter for the choice of an adapted size of equipment.
NOTE ISO 11933-1 and ISO 11933-2 detail a list of characteristics of standardized gloves, glove ports, support rings, cell rings, etc.
4.7.2.3 Accessories used with gloves
4.7.2.3.1 Gloves equipped with a support ring
In a few permanent containment enclosures, gloves can be equipped with a support ring. The support ring is considered as an integral part of the glove, and the whole equipment shall be tested according to the air leak test using a test bench equipped with a cell ring (see 4.7.3).
4.7.2.3.2 Sleeve
Gloves mounted in permanent containment enclosures can be used with an intermediary sleeve, fixed between the glove and the containment enclosure. This sleeve is not considered as an integral part of the glove. It shall fulfill all requirements of this European Standard and shall be compatible with the glove used.
The way of fixation between the glove and the sleeve and between the sleeve and the containment enclosure shall be detailed in the information supplied by the manufacturers.
The sleeve shall be tested with one compatible glove as regards the integrity using the air leak test (see 4.7.3)
Such an assemblage shall resist to a tensile strength test of 100 N according to 5.4.
4.7.3 Specific integrity test for gloves for containment enclosures
The integrity of gloves used in containment enclosures shall be tested by the air leak test described in 5.2. The pressure shall not decrease by more than half the initial pressure. The initial pressure shall be mentioned in the instructions supplied by the manufacturer if it Is different from 3 000 Pa.
4.7.4 Resistance to ozone cracking (static strain)
When gloves can be exposed to ozone, the resistance to ozone cracking shall be determined.
NOTE Powders emitting alpha particles can generate ozone containment enc’osures.
The performance level shall be determined by the method described in 5.3; at least level 1 of Table 2 shall be achieved.
5 Test methods
5.1 Determination of lead equivalent thickness and uniformity of distribution
5.1.1 Introduction
This European Standard specifies several methods by wtiich lead equivalent thickness may be measured. Either method may be used for determination. The determination of lead equivalent thickness does not lead to an absolute answer but will depend upon the source and energy spectrum of the radiation and hence should always be used as a relative measure.
In addition, due to its toxicity, Lead is today more and more substituted by other materials and therefore the lead equivalent thickness shall be checked at different conditions (see 5.1.3). These conditions have been selected because they give a good correlation with the behaviour of the material of the gloves exposed to commonly used radionuclides such as Americium and Plutonium.
NOTE The user should be warned that if other radionuclides are used, the behaviour of the gloves could be different. Several detectors can be used for the detection of the X-rays. The corresponding test methods are developed
hereafter. Either of them can be used for the determination of the lead equivalence thickness.
5.1.2 Sampling
The sampling does not depend on the test method used.
A minimum of two samples shall be tested.
On each sample, a minimum of four measurements shall be done, The definition of the surface of a measurement point is developed in each specific test method. These points are placed.