The photoneutron ray and photoproton ray occur according to the use of the high-energy electromagnetic radiation of LINACs. Here, when measuring the photoneutron ray, the measurement of the photoproton ray is
added due to the characteristics of the measurement instruments for neutrons, so the reliability of the measurement value is low. Therefore, in this study, the self-manufactured solenoid was used to measure the photoneutron and photoproton rays, and the calculation formula using a reaction cross-section was applied to verify reliability. For the 10 MV LINACs and 15 MV LINACs, the proper conditions of the solenoid were evaluated for their application, and for distances of 80 cm, 100 cm and 120 cm from the source to the measurement instrument, the photoneutron dose value and the sum value of the photoneutron dose and photoproton dose values were read according to the installation of the solenoid in the radiation field of 5 × 5 cm², 10 × 10 cm² and 15 × 15 cm². In addition, the calculation formula according to the reaction cross-section was applied to derive a nuclear reaction process number for the test conditions, and a ratio of the photoneutron ray value on the photoproton ray value was compared. The comparison results showed that reliability within 10 % was verified, and in the further measurement of the photoneutron ray and photoproton ray on the LINACs, the usefulness of the solenoid was verified.