single/ double-film technique weld.

[bania83]

Уважаемые переводчики!

Помогите, пожалуйста, перевести термин single/ double-film technique, если речь идет о дефектоскопии.
Контекст:
Radiographic density
Density of films obtained through single film technique should be at least 1.8 for X-ray and 2.0 for gamma-ray.
Density of films obtained through double film technique must be at least 2.6, with a minimum of 1.3 density for each single film.

Заранее спасибо!!

[Liquid_Sun]

http://fpribor.ru/uploadedFiles/files/GOSTs/Series_28_Public_6_Part_4.pdf

[bania83]

Спасибо!!!