• The filters are interposed ( or put , or placed ) in the beam.
• Various thicknesses of some material are placed across a beam of beta rays.
• The filters are interposed ( or put , or placed ) in the beam.
• Various thicknesses of some material are placed across a beam of beta rays.
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012