MAP20071018121 Largent, Edward J. Threshold limit values for physical agents : adopted by ACGIH for 1978 / Edward J. Largent Sumario: Exposure levels for heat stress, ionizing radiation, lasers, microwaves, noise, impulsive or impact noise, and ultra-violet radiation are listed as conditions under which it is believed most workers will not suffer adverse effects by repeated exposure En: National safety news. - Chicago. - Vol, 118, nº 6, December 1978 ; p. 60-68 1. American Conference of Governmental Industrial Hygienists . 2. Higiene industrial . 3. Valores TLV . 4. Contaminantes físicos . 5. Normas . 6. Ruido . 7. Láser . 8. Radiaciones ionizantes . 9. Estrés térmico . 10. Microondas . 11. Radiaciones ultravioletas . I. Título. II. Título: National safety news.