Use professional and technical words in report and fix grammar and sentences.

Introduction
Organizer testing comprises a system for the regular testing of the accuracy that the participant laboratories can achieve. In its usual form, the organizers of the scheme distribute portions of a homogeneous material to each the participants, who analyses the material under typical conditions and report the result to the organizers. The organizers compile the results and inform the participants of the outcome.

Straight agencies require analytical laboratories to participate in an appropriate WPSA scheme where one is available, and demonstrate a system for handling the outcome. This is only one of many requirements of accreditation.

The materials distributed are as close as possible to the materials being regularly analyzed, so that the results of the scheme represent the capability of the laboratories working under routine conditions.

Objective
• To evaluate the analytical performance of the participating laboratories for the determination of the gross alpha/beta in water.
• To assist in finding the root cause of methodological problems leading to unsatisfactory analytical performance in certain laboratories.
• To identify the necessity for further actions to improve laboratories performance ifneeded.
• To provide general recommendations on the overall performance of participatingLaboratories.

Results and discussion.

The results analyzed by the radioactive gamma laboratory of MASTwere in good agreement with the ERD target values and passed the evaluation procedures. TheERD also highly appreciated the performance of the laboratory.
As a result, gamma radioactive activities in water andNeedles determined accurately by this validated quality control sample. It is also worth noting that RTS is a rapid and accurate method for the determination of gamma activities without requiring a tedious sample preparation.