This standard specifies ventilated pressurized clothing and non-ventilated non-pressurized clothing, which are used as protective clothing to protect against radioactive contamination at nuclear facilities, etc.
JIS Z 4809:1993 history
2012JIS Z 4809:2012 Protective clothing for use against radioactive contamination
1993JIS Z 4809:1993 Clothing for protection against radioactive contamination